(Blackspark makes a joking suggestion, Soundwave accepts it, kink experimentation ensues. 

Moderate spanking, sticky interface, oral, and a bit of aft play under the cut. Also a bit of pretend-struggling from someone more than capable of escaping if he actually wanted to.)

Blackspark had been joking
when he’d offered to see if a good spanking made Soundwave more inclined to
behave himself and actually get enough recharge like the medics said he should.

He really, really hadn’t
expected for Soundwave to pause, size him up, lock all the doors into the room
with one gesture, and nod. 

Moreover, when Blackspark approached, Soundwave
lowered his plating in an odd gesture somewhere between submissive and coy, and
gave only a token resistance to being grabbed.

It was odd, but Soundwave’s restrained field was
prickling something like eager/intrigued,
and he made no effort to get away from the firm arm around his waist. Well- no
real effort. He was pushing on Blackspark’s chassis with both servos, playing a
recording of a low growl, but Blackspark would have had no hope of containing
Soundwave if he’d actually wanted to get away.

Baffled but more than eager to try this whole thing out,
Blackspark sat down on the padded-for-silence floor and pulled Soundwave with
him. Still, no real resistance, even as he pushed Soundwave over his lap and
pinned the spymaster’s front to the floor. Aft in the air, chassis and knees
pressed to the padding, claws digging in lightly, visor glinting as Soundwave
lifted his helm enough to look over his shoulder and watch. Gorgeous. A servo on
his back between his spines to pin him, and Blackspark stroked his other servo
gently over Soundwave’s aft, pausing for a moment to let Soundwave get used to
the situation. Comfortable enough, easy for someone who might not have tried
this sort of thing before. “All right then, mech… let’s see how you feel ‘bout
behavin’ after a few good smacks, hm?”

Just in case, he opened a private COMM link, one set up for
easy vocal and glyph transmissions. .:I
won’t push ya, mech. You an’ I both know I can’t make ya do anythin’. But, hey-
you wanna play? I am happy to oblige. Just lemme know if ya wanna change
somethin’, or if somethin’s too rough. Not gonna aim ta really hurt ya, but I
figure you got decent pain tolerance, so this’s gonna sting a bit. If yer up
for that:.

Soundwave pinged him a glyph for understood/appreciated, then stareed up at Blackspark and played –in
Starscream’s most challenging tone, no less- “bring it on”.

Well. Blackspark didn’t pretend to understand Soundwave’s
motivation here, his field was too tightly wrapped to really read, but there
was a tingling of intrigue in the little of his field that Blackspark could
read. Curiosity, then? Soundwave already knew that Blackspark could keep
secrets. So- why not? They could have some fun.

Blackspark patted Soundwave’s aft, then brought his servo up
and landed a firm smack against shadowy grey aft plating. Not too hard, not
yet. Soundwave didn’t even twitch in response. Right- controlled. And evidently
not quite meaning to give up that control all that easily.

Alright. Blackspark could try harder.

Purring softly, he landed another couple of smacks, slightly
harder, and grinned as Soundwave’s vents revved just a fraction. Well now.
There was always the slim possibility that Soundwave actually wanted –for whatever
reason- to be spanked in a non-sexual context, but Blackspark’s suggestion had
been laced with suggestive undertones, and feeling the air patterns shift as
the spymaster’s vents widened was a good indication that this was not meant to be non-sexual.

In the interest of making it even less so, Blackspark
activated the vibes in his fingertips and traced them gently over the sensitive
plating he’d just been striking, plating he knew had to be tingling by now. “Hm.
Not havin’ much of an impact here, am I? Lemme see if I can change that.”

Another spank, this one considerably harder, with his vibes
momentarily running at top speed. Soundwave jolted at that, and Blackspark
swore he saw twin optic-glints through the blank visor for half an instant,
then Soundwave’s engines growled up at him and narrow claws dragged roughly
against Blackspark’s hip. Enough to leave light scratches, with enough force to
dip into a seam and prick at the mechanics underneath. Not an escape attempt,
though, and what little he could feel of Soundwave’s field unfurled a fraction
and pulsed a blatant challenge.

Well.

Blackspark purred, engine growling in return, and landed
another smack- still hard, but without the vibes to push the sensation towards
pleasure. This was hard enough to at least border on hurting, and the spymaster
almost twitched in response, then removed his claws from Blackspark’s frame
after another swat.  Progress.

And then Soundwave growled up at him, louder, obviously
braced his pedes, and tried to squirm away. It failed, of course, because his
telegraphing his attempt made it easy for Blackspark to grab him by the scruff
and hold him still.

“Ah, naughty,”
Blackspark purred, and repeated the vibe-aided swat that had gotten him a good
reaction before. Soundwave jolted again, speakers making a staticky noise, and
kept squirming. At least, for the next half-dozen smacks, to the point where
Blackspark knew from experience he had to be getting sore. His plating was
definitely scuffed. His field was tingling excitement/interest/rebellion
with a clear undernote of arousal, though, and a gentle caress to his codpiece
was all it took to feel how hot he was getting. Optics narrowing, Blackspark
revved his vibes and landed another swat- this one much gentler, but targeted,
aimed with his buzzing fingertips directly against Soundwave’s heated panel.

Soundwave made another staticky noise, legs twitching
noticeably this time, then shuddered and went limp in Blackspark’s lap. Another
burst of static, this one much quieter and almost apologetic, then Soundwave
un-braced himself in a clear sign that he was done struggling.

“Aw, there we go. Good mech. Now… I wanna make my point real
clear. An’ I wasn’ gettin’ very far before I started on this hot li’l panel of
yours, so… let me try somethin’. You open up for me, Soundwave, lemme make sure
this li’l lesson sticks in your mind… an’ I will make it” a brief pause,
Blackspark tracing his buzzing fingertips around the seams of Soundwave’s panel
“more than worth your while. C’mon, beauty… open up.”

A glance over his shoulder, Soundwave’s field fluttering a
mix of consideration/arousal, then he
lowered his helm and opened his panels as requested. Outer and inner panels
both, revealing his valve, the bio-lights pulsing brightly as a trickle of
lubricant dripped down over his brilliantly glowing exterior node. Enough that
he’d evidently been turned on almost since the start of this.

“Oh… good mech. Good Soundwave,” Blackspark crooned,
ever-so-gently caressing Soundwave’s node, and lifted his servo to taste his
fingertips. “You taste so sweet. Now…
be good for me. Keep these pretty hips up, keep your panels open, lemme give
your valve a few li’l spanks.”

He wasn’t about to be that rough with Soundwave’s valve. He
might, if he knew for certain his partner enjoyed outright pain, but it wasn’t
the sort of thing he wanted to do without discussion. So far, nothing he’d done
should truly hurt. Sting, yes, and Soundwave was probably aching slightly by
then, but always with pleasure signals thoroughly mixed in. Blackspark had
plenty of practice on both ends of this, he knew what he was doing, and he wasn’t
about to be any rougher without Soundwave specifically stating that he wanted
to be hurt. He was reasonably certain that Soundwave didn’t want that, so he
was gentle with the pretty, wet valve. Mostly.

The first smack to his valve was more of a firm pat, and
Blackspark lingered, caressing softly with stilled fingertips. Gentle. Then,
just a bit harder, activating his vibes. A half-dozen reasonably light swats to
Soundwave’s exposed valve, interspersed with light spanks to his aft plating,
clearly having more effect on the spymaster than anything Blackspark had done
yet.

Soundwave’s vents kicked up higher, enough to be easily
heard, and he squirmed just a fraction. Strong legs twitched at every smack to
his valve, his bio-lights brightened, and the drip of lubricant from his valve
became a steady trickle. At the final spank, gentler than the rest, all vibe
and no strength, his speakers blatted static and his back arched, then he
settled again and his engines purred.

Moving in a languid manner that suggested he was tired,
Soundwave propped himself up on his elbows, almost wobbly as he leaned in to
bump his helm against Blackspark’s shoulder. Submissive, almost, and definitely
relaxed.

Blackspark loosened his grip, letting Soundwave move, and
stroked a firm servo down his back to help him settle. “Aw. That’s it- good
spymaster. Bein’ real sweet, hm? Good. I think we’re done here, Soundwave,
though I might have to insist you come berth with me so’s I know you rest some.
First, though…”

A lingering stroke over Soundwave’s dripping valve, then
Blackspark lifted his servo and sucked lightly on his fingertips, giving
Soundwave a moment to watch and listen. “That’s gotta ache. You want me t’ kiss
it better?”

Soundwave purred, and Blackspark purred back, gently nudging
the spymaster out of his lap. “Alright. Here- up. C’mon, brace them servos on
that chair. Bend over, panels open, legs apart, lemme at yer valve. I am gonna
lick you out ‘till yer knees give out, an’ I got somethin’ real nice in mind ta
show you once you get comfy.”

Was it his imagination, or was Soundwave unsteady as he
stands up? Just in case, and under the guise of maintaining control, Blackspark
supported the lanky frame until Soundwave was braced against his own chair. Again,
a beautiful image- bent over with his pedes braced apart, scuffed aft plating
and dripping valve on display, bio-lights flickering and pulsing brightly as he
looked over his shoulder again at Blackspark. The perfect invitation.

Blackspark purred and dropped to his knees behind Soundwave,
ex-venting hot air over that pretty valve, then leaned in and licked a long
stripe up the glowing folds. Hooking one servo around Soundwave’s thigh, he
leaned in and set to work, licking in long, slow strokes. As he did, he reached
into subspace and pulled out a little toy, one of his favorites that he kept
easily available for impromptu interface. A small thing, its thickest part not
even as wide as two of his fingers, tapered smoothly at the tip and narrowed
just before the wide base. Turning it on, he pressed it firmly against
Soundwave’s inner thigh and trailed it up, demonstrating part of why this toy
was a favorite. The vibrations were surprisingly deep for such a small toy,
rumbling and beautifully penetrating, perfect for what he had in mind.

A long, lingering suck to Soundwave’s node, then Blackspark
pulled his mouth away and replaced it with the toy, sliding it gently between
the spymaster’s folds to slick it up. With his other servo, he stroked gently
over Soundwave’s aft, then tapped firmly on the little cover over his aft port.
“Got a nice li’l plug here. Gonna feel it all th’ way up yer valve if I pop
this in yer aft. So, as long as yer bein’ good… how ‘bout you open up for me?”

.:I’ll take a ‘no’ for
this, Soundwave, no questions. Your choice here. You are gonna love this if it’s
somethin’ yer into, but if not, I’ll stick to teasin’ elsewhere. Either way,
gonna be gentle:.

Blackspark was a reasonable person. Some people didn’t like
aft play, or didn’t want to try it, so he wasn’t about to push in the slightest.
He wasn’t above making the idea more tempting, though- tracing the slicked-up
toy gently over the thin cover in his way in a little tease.

Soundwave cocked his helm, staring over his shoulder at
Blackspark, clearly considering the idea. After a moment, he nodded once and
opened the cover over his aft port, claws tightening slightly on the berth.

As promised, Blackspark was gentle. Another few rubs of the
toy against Soundwave’s valve, coating it in lubricant, then he pressed the tip
of the toy against Soundwave’s port and rubbed a fingertip of the other servo
against his node. “Good, good mech. Juuust relax… nice’n easy. Lean back a li’l-
there we go.”

The tapered shape of the toy made it easy to fit into place,
and Blackspark purred approvingly once it was in, lightly patting Soundwave’s
aft. “Good, Soundwave. Now… you jus’ enjoy that.”

When he applied his glossa to Soundwave’s valve again, he
could feel a hint of the vibrations. Soundwave would be feeling a lot more than a hint, and having the vibe in
his aft port meant Blackspark could lick at his valve unobstructed, lapping and
suckling at slick folds and gently pressing inside. Mm- it was things like this
that made him strongly consider adding a vibe mod to his glossa, if he wasn’t
worried that he’d cut himself on his own fangs. No need for a vibe toy then.
The added weight of an aft plug was nice, though.

Soundwave hadn’t shown any particular response to the little
toy, only obliged Blackspark’s request, but the vibrations in combination with
Blackspark sucking on his node had his legs shaking. Outright panting,
Soundwave shuddered and shifted his weight, supporting himself more on his arms
as his knees refused to quite obey. He was near overstimulation, but
deliciously so, and his speakers gave a strange crackling noise almost like a
moan as Blackspark pressed deeper.

Not surprising, it wasn’t long before Soundwave overloaded
with a cry entirely made of static. His knees almost gave out before Blackspark
caught him, and he shuddered and purred, curling
to the side as he slumped to the ground. Deliberately- that was where
Blackspark was.

“Yeah- I gotcha,” Blackspark muttered, supporting the lanky
frame with his own, and helped Soundwave down onto the padded floor. “Told ya I’d
make yer knees give out. Hold still- lemme turn that toy off. There we go. I like that thing- take it you do, too?”
he chuckled, lightly patting the base of the turned-off plug, but made no
effort to pull it out. “We’ll just leave that there a bit. You are gonna stay
right down here, relax, an’ I am gonna be sure you come back outta subspace for
me. You feelin’ alright? Anythin’ hurt more than it oughta? Shouldn’t be
anything hurting, not really, just a li’l sore.”

Soundwave nodded, curling so that his helm was in Blackspark’s
lap, and extended his datacables to grab the bounty hunter. Engines purring, he
curled around Blackspark, then flicked demandingly at a particular subspace
hatch until Blackspark laughed and pulled out an energon cube to give him. And
a straw. Blackspark evidently carries straws.

“I’m takin’ this as you bein’ fine. Still, I want you to
rest a li’l bit. After you get some rest… round two? I can spike you, you can
spike me- Pit, you can try spankin’ me if you want, I can give you some
pointers. Got any other kinks you wanna try out?” Blackspark chuckled,
half-joking, and grinned a sharp-edged grin as Soundwave nodded.

He was more than up for whatever else that would be. Maybe he
was halfway joking, but he didn’t make sexy jokes that he wouldn’t be entirely in favor of following through
on. Partly because sometimes people took things like “let’s see what happens if
I spank you” as actual suggestions, and when they did, it was fun.

Soundwave, for his part, had zero regrets. Blackspark didn’t
discuss interface partners who didn’t want to be discussed, and he already knew
Soundwave didn’t want to be. He could keep secrets, and was far from the type to
take advantage of potential blackmail material unless someone had done
something he considered to be a serious moral wrong. His morals were closely
aligned with Soundwave’s, so that wouldn’t be happening. Plus, none of his
blackmail material (most of which Soundwave had seen) was about interface
preferences. He considered that an extremely low blow.

And, as for the physical aspects… mm. Soundwave felt…
pleasantly light. Relaxed. His aft plating and valve rim ached slightly, but it
was an enjoyable ache, and the strange sensation of the toy in his aft port was
nicer than he would have expected. He’d accepted the toy with the vibrations in
mind, and because he hadn’t felt like refusing something merely because he had
no strong desire to try it, but the stretch of the plug itself had turned out
to be fairly nice. He… might have to see if Blackspark knew where to get
another of these toys for his own use. Could make a nice counterpart to his own
data-cable in his valve.

And, as for trying out another kink… he had something in
mind. Wouldn’t mind a round two. Or three.

For now, though, he was going to enjoy the lingering
floating sensation and curl up with his helm in Blackspark’s lap. He could
trust Blackspark not to laugh, poke fun, gossip, or murder him in his sleep.
Roughly 57% of that tough attitude was an act hiding a genuinely kind spark.

A genuinely kind spark that was now manifesting in
Blackspark stroking Soundwave’s audial fins as he drifted off. Not at all objectionable.

Mm.

Soundwave decides to take advantage of an empty ship to have some fun in Megatron’s throne, Megatron walks in and finds him, a considerable amount of fun ensues. 

Loosely TFP, but with Megatron actually sane and a decent person. This is like good-ending TFP, basically. No significant warnings. Improper use of data-cables, some awkwardness and general embarrassment, and relatively minor fluid stuffing with a biological basis- i.e. overflow tanks are a thing in Cybertronians and get full when you have a larger-than-you partner. Spike-in-valve smut, little bit of showing off, gets a bit fluffy. Definite praise kink somewhere in there. 

Soundwave very rarely got any time to have the ship to
himself. But, with everyone out on reconstructive efforts and attempts at
socializing, he was left mostly alone. Which meant he had the throne room to
himself for non-urgent reasons for once, and, mm… he had plans.

Plans which were turning out to be a lot of fun to work on.

Nuzzling into the back of the throne, Soundwave rocked his
hips and spread his thighs wider, inhaling deeply to fully enjoy Megatron’s
scent. Strong, powerful… and stil warm. Which made it easier to imagine that
the datacable he’d wrapped around his own frame was the pressure of strong
servos on his hips, to imagine that the cable slooowly pressing into his valve
was a thick spike. Good, good- but not quite as good as the real thing. Which
he should stop thinking, he wasn’t going to get that, and- ah!

Mmh, nice- that was a sensitive spot. Soundwave exhaled
slowly and rocked his hips down again, taking the cable a bit deeper, and
curled the tip slightly to rub against that spot again. Ah, yes- that was good.
Of course it was good- Megatron was an intelligent mech with plenty of
experience, he would know how to find the right spots.

Helm lolling back, Soundwave panted and whined softly, valve
clamping down around the cable, starting to relax completely-

And immediately went incredibly, painfully tense as he heard
the door slide open. Pit- slagging pit- he’d
locked the door! He’d definitely locked- and oh, no, there was only one other mech who had the codes to unlock that
door, and that was-

Curling into himself in embarrassment, Soundwave hunched his
shoulders and tried to pretend he wasn’t there, whining in mortification as
Megatron approached him.

Megatron slowly walked up to his occupied throne, brow
ridges raised, and paused for several long moments before speaking. “…well
then, Soundwave,” he began, then smiled slightly and moved to put himself where
Soundwave could see that he didn’t appear to be upset, “are you enjoying
yourself?”

…yes. Soundwave nodded slightly, once, hunching his
shoulders even further and hiding behind the flat of his arm. Pit- this was
mortifying. He’d been caught pleasuring himself on Megatron’s throne, clearly
thinking of Megatron, and still had the cable pressed into his valve- mostly
because it would hurt to yank out at this point with how tense he was. This was
not how he’d wanted to express his
interest, this was embarrassing- but,
yes, he had been enjoying himself.

Megatron slowly reached to stroke Soundwave’s arm, coaxing
the spymaster’s servo down away from his face, and pulsed a field full of soft
reassurance to the flustered mech. “Well then… my apologies for disturbing you.
Now… I have a question, and you are free to think before answering. Do you want
me to leave so you can continue enjoying yourself here, or do you want me to
join you? I am open to either option… though I confess I would prefer the
latter.”

Firmly meeting Soundwave’s optics, the former warlord slid
one servo down to touch Soundwave’s narrow claws, trying to ease their tight
grip on the edge of the throne. “Please understand, you are under no obligation
to let me touch you. Easy- you know me, Soundwave, you know I would never hurt
you. And you have my word I will leave if you ask. So… with that in mind…”

Purring gently, he loosened Soundwave’s servo and lifted it
to his lips for a soft kiss, trying to charm the nervous mech into relaxing.
“Do you want me to join you?”

Oh.

Yes. Primus, yes, absolutely. He couldn’t see why Megatron
would want him, given how many mechs
would more than willingly berth
Megatron and had expressed their interest in the past, but… oh, if Megatron
wanted this, absolutely.

Soundwave nodded slightly, optics wide, and slowly turned to
face the larger mech. He… wasn’t certain how to start here, but yes. Please.
Because he trusted Megatron- he knew his Lord wouldn’t hurt him, would never
hurt anyone like that, but especially not him.

Megatron held Soundwave’s servo gently between his own,
engine purring in approval, and slowly moved to stand in front of his throne
where he could look Soundwave over. “Thank you, Soundwave,” he purred, his tone
as soft as he could manage, not wanting to spook the still-tense spymaster into
running. Poor mech didn’t deal well with embarrassment, he was shy. Time to
reassure him.

“Let me be clear, Soundwave. You are allowed to refuse at
any time, and I will not be upset if you change your mind. If you are
uncomfortable at all or have a request, please
tell me. Anything you want, I will be delighted to oblige. Am I understood?”

He waited for a nod, then purred softly and leaned down
slightly, projecting interest/arousal/reassurance
to the pretty spymaster in his throne. “Good. Now- turn around, Soundwave,
get comfortable, and slowly pull that cable out of your pretty valve. Let me
see you. The rest of you is so lovely… I want to see what your equipment looks
like.”

Oh, Primus. Optics
dimming slightly, Soundwave nodded and slowly turned around, optics flicking
between Megatron and the floor. Shy, he eased his thighs apart and glanced up
at his watcher, biting his lip, then slowly eased his data-cable out of his
valve. He’d… never done anything like this for an audience, but the way
Megatron was looking at him made fire curl in his belly and wrap up around his
spark chamber. That was- oh, Primus, admiring.
Lustful, yes, but not threatening, not
like he wanted to take something- like he was delighted that Soundwave was
willing to give him this.

So he let Megatron see his valve, then he took it one step
further, wrapping the lubricant-coated cable around his thigh and pulling his
legs apart. He could feel himself
blushing, but Megatron purred in
approval, the sound drawing a flutter from his spark, and… oh. He wanted more
of that.

So, shy but more than willing, he lowered a servo and spread
his valve lips open with two careful fingertips to show off the lights.  

Pulsing stronger approval/arousal
to Soundwave, Megatron stepped closer and gently slid his servos around the
spymaster’s frame, lifting very gently to start shifting him around. “Oh, such
a beautiful mech. So, so lovely, and so smart.
Whatever made you think I wouldn’t be interested in you, Soundwave? You are
gorgeous, intelligent, and charming,” he
purred, then chuckled at a questioning little glance. “Yes, you heard me,
charming. In your own, precious way. If you had asked me, I would have very gladly accepted, just like now.
Here… let me get you comfortable. Just relax for me.”

Soundwave was light, and it was no effort whatsoever
for Megatron to lift the lanky mech enough to sit down where he had been a
moment ago. He could feel Soundwave quivering
against his servos, tightly coiled field buzzing anticipation/excitement/intrigue/arousal/nervousness against Megatron,
but the spymaster was moving with him and there was no fear in his
oh-so-expressive optics. Maybe a bit nervous, but clearly willing, exposed
valve radiating heat against Megatron’s plating as they settled into place.

Engine rumbling soothingly, Megatron set Soundwave in his
lap and stroked the spymaster’s back with one servo, gently splaying those
gorgeous thighs around his hips with the other servo. “There we are, Soundwave.
Comfortable? Good. Now, beautiful… I would like to spike you. You have such a
pretty valve, and… I imagine that’s what you were thinking of, hm? My spike in
your valve? I confess, I very much hope so, because…”

Pausing, he gently palmed one of the spines along Soundwave’s
back, rubbing it between his fingertips in a fairly suggestive gesture as he
purred his desires to the gorgeous mech in his lap. “I want very much to feel
your valve around my spike. I want to see you in my lap, want to see you in
pleasure… I want to watch you ride my spike and take your pleasure with me. I
am open to other suggestions, but… what do you think of that?”

Okay. Soundwave
nodded quickly, then whined quietly, flustered, and pushed his face into
Megatron’s shoulder to hide. Yes, yes- absolutely. That was his exact fantasy, Primus- him in Megatron’s
lap, riding his Lord’s spike, in control-
Primus, he wasn’t about to refuse that. Especially not combined with
reassurance. And praise, Primus take
him now, Megatron was praising him
and it was sincere. Soundwave knew
the voice that Megatron used to flatter others, and that wasn’t it.

…other people didn’t get this turned on by praise, did they?
Because he knew praise kinks existed, but this was unfairly hot and was making it very difficult to focus. But, for
this, he would try.

Settling his frame against Megatron’s, Soundwave slowly
rocked his hips against the larger mech’s, breathing a quiet sigh of pleasure
as he rubbed his valve over the heating pelvic plating under him. Without his
cable spreading his valve open, he felt empty,
and he wanted something. Specifically, he wanted Megatron’s spike inside
him. As close to now as possible. Giving a quiet, pleading warble, he ground a
bit harder against the closed panel, trying to coax Megatron to-

Oh dear.

Megatron shifted before opening his panel, making sure that
his pressurizing spike wouldn’t end up pressing too hard on Soundwave’s valve,
and cupped his servos against the slender mech’s aft for support. He’d felt
Soundwave twitch away from him, and he could understand why- his spike would be
a stretch for someone close to his size, and Soundwave had lanky hips.

Careful not to trap
the spymaster, he rubbed gently at Soundwave’s lower back with one servo,
slowly easing the other down his aft until he could just touch the lower edge
of that pretty purple valve- a soft tease. “Easy, Soundwave. You have nothing
to worry about- we can go as slow as you need. I will not cause you pain, I
promise. Here- rub against me first, see how I feel against you. Figure out if
we need to stretch you open further before we proceed. And- listen. If you do
not think you can comfortably fit my spike, we can do something else. We are
both clever mechs, we can come up with alternatives. See how you feel, then let
me know.”

Relaxing again at the reassurance, Soundwave settled back
into place and looked down at Megatron’s spike, slowly wrapping a data-cable
around it to feel it out. Unsurprisingly, it was fairly large, wider than
anything Soundwave had taken so far. But… not by too much, and, unlike his
cable, shaped to fit a valve. And there were a series of ridges along the upper
edge that he… rather wanted to try out. So… a large spike, yes, but-

Well, the thing that helped make up his mind was that it was
attached to Megatron. Megatron, who would never hurt him, was purring
reassurance to him and rubbing his back and waiting
despite the growing arousal in his field. This was safe- just as safe as
playing with a toy back in his quarters, except with Megatron. Which was delightful, not just for the warmth and charge
and sensations, but for the praise and
for the mech he trusted, the mech he adored,
holding him close. Primus.

So he took the offer. He could do this- he could take
Megatron’s spike, absolutely. Or- at the very least, could do something with it, something to bring
them both pleasure.

Optics on Megatron’s face, he lifted himself up and slowly ground
his valve against that impressive shaft, panting softly in arousal and
anticipation. And, oh, already an
improvement over his toys, because there was charge jumping between them as he
rocked against Megatron, and because his Lord was purring in pleasure against him.

Lowering his data-cable to wrap around just the base of
Megatron’s spike, Soundwave carefully lined himself up, then rocked his hips
down in one slow motion. He was wet enough that it was an easy slide, the tip
of that pretty spike slipping easily into his valve, and he paused like that to
consider the sensation before offering Megatron a nod and a tiny smile. Yes- he
could absolutely do this. Might need some time, but he could. Could absolutely
do this… just lower himself, nice and slowly, and stop if he had to.

Optics dimming, he settled against Megatron’s frame and
purred softly, unfurling his field to purr bliss/arousal/anticipation
to the larger mech as he started to press down further.

It took more than a little effort for Megatron to stay still
as that hot, tight valve started to wrap around his spike, but he managed it.
Mostly because he absolutely refused to buck into Soundwave, not with how tight
the spymaster was. No matter how teasing it got, he was not going to risk making Soundwave even slightly uncomfortable.
Besides, there were nicer things to focus on right now.

Whispering “that’s it, be gentle with yourself”, he cupped
one servo against the side of Soundwave’s helm, pressing his thumb to deep blue
lips until they parted for him. Sharp dentae gleamed in the light as they slid
apart, and Megatron purred in approval as Soundwave’s flexible glossa wrapped
around his thumb. “This is lovely- so unique. I would –ah- love to feel this against my valve, if you would be willing. But-
for now, a kiss, sweet?” he whispered, and grinned when Soundwave immediately
pressed against his servo.

As soon as Megatron took his servo out of the way, Soundwave
leaned up to kiss him, awkward but very eager. It was more than rare for
Soundwave to be awkward, but it was cute,
and Megatron purred as he returned the kiss. As he’d thought, that slender
glossa twined easily with his, muffling a groan of pleasure- and Soundwave’s
field finally blossomed open fully into a shimmer of pleasure/anticipation/nervousness/trust. Even better than the kiss.

Soundwave eventually leaned back away from the kiss, mostly
so he could pant for more air, then moaned and rocked down a bit further. There
was a stretch, but nothing unpleasant, and Soundwave crooned a soft, shaky
noise up at Megatron as he felt the first of the ridges press against the rim
of his valve. Another rocking motion, this one much smaller, and the ridge
popped inside in a quick flare of pleasure.

Megatron’s engine was purring louder against him, field
rumbling arousal/bliss/pleasure, and
Soundwave wanted to feel more of that- wanted to get more pleasure, to give more, so he slowly lifted up and
rocked back down a couple of times in an effort to loosen his calipers up.

An effort that worked, pulling a startled, staticky cry of
pleasure from him as he sank down much further than intended. OH, Primus-

Megatron inhaled sharply, hips twitching up despite his best
efforts, and steadied Soundwave’s frame with both servos to keep him from
sliding down further. “Ah, Soundwave-
easy, are- nnh- are you all right? You feel… amazing, gorgeous, so hot, and your optics- you are beautifully expressive, do you know that? Such
bright optics, so sweet- I can see your pleasure unfold.”

Vents gusting hot air to help cool his frame and keep his
control, Megatron cupped a servo against Soundwave’s aft and squeezed lightly,
sliding the other servo up his partner’s side to brush over the glowing lines
in his stomach. And, ah- apparently
Soundwave was more than all right, because it only took a few deep vents for
the spymaster to start working himself down again, this time stopping tantalizingly close to taking his entire
spike.

“That’s it, Soundwave- so good, and, mm, impressively flexible- come on, just a bit further?
You can do this, gorgeous- one more little motion, sweet?”

Megatron sounded almost needy,
and it reached Soundwave even through the haze of pleasure. Oh- he’d been
rather slow about this, hadn’t he? And he didn’t want to keep Megatron waiting,
so he pulled himself up, paused for half a nanoklik, and rocked down again-
and, this time, felt his node grind against the area just above the base of Megatron’s
spike.

Helm lolling back, he moaned softly and loosened his bracing
grip on- whoops, he was digging his claws into Megatron’s upper arms. Offering up
a soft smile, he let his data-cables wrap down and around the warlord’s frame,
then lifted Megatron’s hips at the same time as he propped himself up slightly.
He wanted to feel Megatron, wanted to
feel those ridges slide in and out of him, but his knees had decided not to
cooperate and he wasn’t sure he trusted himself to move steadily. So- he could
leave it up to Megatron, ri-

Ooh-

 

Whispering “thank you, beautiful”, Megatron slide his servo
down from Soundwave’s aft to hook under his thigh, supporting him gently as he
thrust up into that beautiful valve. Not hard, just a slow, gentle motion, then
again, rocking in and out of Soundwave and gradually easing him open further. And
talking to him the entire way, having already figured out how much Soundwave
liked it. “So good… that’s it. Let me hear you, beautiful… let me hear your
pleasure?”

To his delight, Soundwave obliged. Every thrust from then on
drew a soft, staticky cry from the spymaster, gradually getting louder as
Megatron started to thrust harder. When the thrusts no longer met any resistance,
Megatron lifted Soundwave a bit higher, pulling out further than before and
then thrusting harder. The deeper, stronger thrust earned a louder cry, but,
just to be sure, he paused to ask- he needed to be certain it felt good. “Soundwave,
my sweet- such beautiful sounds, but- do you like that? Do you want more?”

Soundwave was caught a bit off guard by the deeper motion,
but Pit yes, he wanted more. Much
more. Warbling the steadiest affirmative he can manage, he pushed himself up
and sank back down to mimic the motion, then relaxed completely against
Megatron- leaving it up to the larger mech to decide what happened from then on.
Ohh dear Primus- that was it, he was done. This was amazing, and he absolutely wanted more, but his knees were still
uncooperative and the praise had him
wanting to do nothing more than just bury his face in Megatron’s throat and
moan.

Gripping onto the warlord’s arms in anticipation, Soundwave
gently squeezed the powerful frame with both data-cables, trying to encourage-
then gasped as Megatron did exactly what he wanted Megatron to do. Namely,
lifted him up and then brought him back down to meet the next thrust, rubbing
the ridges on that lovely spike along the inside of his valve rim.

“Ah- thank you for your trust, Soundwave, “ Megatron purred,
then gave up on coherent speech for now and just continued to thrust, reveling
in the sounds of bliss he was earning. Soundwave’s servos were gripping his
plating tight enough to dig the clawtips in, but he couldn’t bring himself to
care in the slightest, and the rhythmic squeezes of the powerful data-cables
around his frame only served to spur him on. Soundwave was beautiful, glowing frame and half-static voice alike, and to hear
his loyal friend in such pleasure was absolute bliss.  

And there were benefits to having such a light partner, one
of them being that he could easily shift the angle of Soundwave’s hips to try
for different, better spots. A careful motion, then another, then a slight
angle back, and-

Completely past shame, Soundwave squealed in pleasure as the calipers at the very back of his valve
clamped down around the tip of Megatron’s spike, rocking his hips down and into
the thrust to feel the friction against- what was that?

Frame tensing, Soundwave held himself in position, a hint of
curiosity flickering through everything else in his optics, then moaned quietly
as he realized what that must be. Well- as it was realized for him, by a soft spreading feeling deep in his belly. That must be the entrance to his
overflow tank opening, he hadn’t felt it before but it must be, it made sense, and-

And his next cry was a quiet, pleading whine, accompanied by
another rock of his hips, trying to get Megatron to-

He knew the function of an overflow tank, and, since there
was no risk of any unintended consequences, he wanted to experience at least
part of that function for himself. He wanted- Primus, he apparently wasn’t quite
past embarrassment, but he wasn’t even remotely
ashamed of wanting to feel Megatron fill
him.

 

“Easy- I have you, Soundwave, my beautiful, loyal friend,”
Megatron purred, sliding one servo up Soundwave’s back to offer more support
and pull him closer, and began to rock into Soundwave’s valve again. Small,
quick motions, not too hard or deep, meant to stimulate those deep nodes- and
to help hasten his own overload. He’d felt that shift against the tip of his
spike, he could guess what Soundwave was trying to ask for, and he knew how to
give it.

Growling in pleasure as he felt Soundwave’s claws skitter
against his plating, Megatron held his partner as close as he could while still
able to move, releasing enough of his control to let his charge build with no
restraint.

Keening against Megatron’s chassis, Soundwave dug his claws
in to brace himself against Megatron’s thrusts and let himself voice every
clear sound he could manage, trying to encourage the warlord to- yes, Primus,
to keep doing exactly this, please, more-

He could feel Megatron’s charge building, could feel it crackling
around both their frames, and Megatron was still calling him things like ‘beautiful’, and that was a very good spot being rubbed against with
an impressive amount of strength. Biting down on the plating he was nuzzling
into, Soundwave skreeled in pleasure as Megatron thrust once more- twice more-

And then his awareness spiraled down to nothing but the wet,
charge-filled heat flooding deep
inside him as Megatron overloaded. Overload hit Soundwave just a nanoklik
after, bouncing some of Megatron’s charge back to him, and the spymaster wailed
shakily against the plating his dentae were digging into. Every bit of his
frame curled around and against Megatron, valve calipers rippling around the
thick spike spreading him open, then he went limp into the larger mech’s lap
and moaned up at him.

Oh, Primus. He’d-
he’d never felt anything to do with his overflow tank before, toys didn’t work
for that unless they were specialized, but the novel stimulation of a large
partner must have done the trick. And now… now he had a spike filling his valve
so thoroughly that almost all of Megatron’s transfluid had ended up in his
overflow tank, and… mmh.

Wow.

…why hadn’t he asked about doing this before?

Okay… time for a reboot, everything was… sluggish.

Megatron purred softly and gathered Soundwave up, pressing a
kiss to his audial fin, but carefully didn’t pull out of the spymaster’s valve.
He’d leave that to Soundwave. “Such a pretty mech… oh, so, so pretty. And I
love your voice, Soundwave.
Different, but… still you, my lovely.
Oh… are you all right?”

Ah. Must have been a delayed reboot. Humming, Megatron
stroked circles on Soundwave’s back and sides, brushing away remaining
fragments of charge, and held him gently until he started to stir. “Ah, there
you are. I take it you’ve had fun?”

Yes.

Soundwave bumped his face into Megatron’s throat, trying to
communicate… something nice, he wasn’t sure yet, and squirmed around his stuffed valve and overflow chamber. That- okay,
that was a bit much, and he whined quietly and clawed his way up Megatron’s
frame until his partner got the message and gently pulled out.

That didn’t ease all of the pressure, though. His overflow tank
was definitely full and had closed to
stay that way, and Soundwave cupped a servo across his stomach to help himself
focus on the heat. Which allowed him to register the very slight swell in his own stomach, from… well, Megatron was larger than him, might not have had a spike overload in awhile, and… hm. The end result was Soundwave’s overflow tank stretching to accommodate everything. It felt strange, but it was a very nice sort of strange, and much less messy than the
alternative. Though this was still messy… partly thanks to his own valve, there
was a considerable amount of lubricant slicking his thighs. Which didn’t feel
excellent.The full overflow tank, though? That felt excellent. Made him blush even more, but… wow. 

As soon as his frame was steady enough, Megatron stood up
with Soundwave in his arms, easily supporting the spymaster’s lanky frame with
one servo on his back and the other arm slung under his aft. “Relax- let us get
you cleaned off, Soundwave. We have some time before everyone else gets back,
so… unless you have any suggestions, I am going to take you to the washracks,
get you cleaned up, and then… I would like to take you back to my quarters.
What happens next is entirely up to you, but I would like to keep you curled
against me like this for longer. You are warm, you purr nicely, and I have
never felt you this relaxed. I would
like it to continue. Are you open to that?”

Judging by the quiet, shaky,near-musical crooning in his
audials, Soundwave was very open to this whole situation.