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Contrary to popular belief, Eijirou has always been a light sleeper.
It's normal for him to wake up in the middle of the night over the quietest of sounds outside his windows. When he was attending UA, the sound of anyone going to the bathroom or generally leaving their room in the early hours of the morning would stir him awake. It's a pretty helpful skill to have since becoming a hero for rare instances like this; asleep in a random building on a worn out futon, surrounded by a few other heroes that have also found themselves on lock down in the area, off the clock from patrolling and ensuring everyone is safe.
Eijirou hears and feels the light padding of footsteps approaching, pulling him out of a dreamless sleep. The tiring weight of his body tells him it's still late at night and nobody should be awake. He remains still, breathing even, listening for where those feet go. They're intentionally light to keep from waking everyone in the room, confident like someone who knows where they're going in the dark. His gut tells him it's just someone trying to find the bathroom or can't sleep—
"Katsuki?"
And he was correct.
Hearing your voice releases all the built up tension in his body, letting out the breath he'd been unintentionally holding, before melting back into the uncomfortable futon on the hardwood floor. There wasn't any danger and he could go back to sleep.
Katsuki grunts in response, full of sleep and his usual disgruntledness—especially since his sleep was being disturbed. When he opens an eye and sees it's you, that growl in the back of his throat softens, mumbling nonsense with his arm holding the thin blanket open. You gleefully crawl inside the opening, pressing yourself into Katsuki's warmth, and Eijirou thought that would be it for the night.
Sleep was crawling through the edges of his mind, bleeding into his thoughts and tempting him back to some peaceful slumber. Just as he was about to fall into its comforting embrace, another sound catches his attention, dragging him right back out.
It was gentle and Eijirou just about determined it was kissing. So very quiet yet he was close enough to hear the light sounds of you and Katsuki swapping saliva. Nothing new and definitely nothing he hasn't seen with his own eyes at a party. He doesn't think much about it until the kiss seems to become more with the sound of breathy sighs and an airy gasp.
Now, he'd furrowed his brows, eyes still closed and his back to you both. Remaining as still as he possibly can, he tries to ignore it and fall back asleep. Eijirou might be a light sleeper but he's also learnt how to ignore non-dangerous sounds. Whatever you guys are doing is none of his business, surely you're not going to do anything so risky with not only him right next to you, but a handful of other heroes spread around the room.
"Kats…"
Oh, you guys are doing something risky.
An undeniable moan that was so very quiet, Eijirou almost tried to convince himself it was a hallucination. Maybe he was dreaming and didn't realise it—the light and very infrequent patting of skin meeting skin tells him he's likely not. Both of you are breathing heavier even if neither of you are actually moaning, the fabric of the futon creating a slight noise with someone's rhythmic movement. You're trying to be quiet and courteous of the other heroes, but Eijirou can hear everything and his cock is rock solid in his pants.
It's not like he's going to able to sleep listening to you guys fuck, especially not with a raging erection, nor is he willing to embarrass everyone involved by asking you guys to take it elsewhere. Instead, Eijirou moves his hand slowly to his pants, palming himself through the material. His hero pants are loose fitting and give him enough breathing room to not be packed away tightly, though he moves carefully to pull down the waistband of his pants enough to free himself.
Eijirou's mouth runs dry, biting his bottom lip with his eyes still closed as he squeezes his head. Already he was leaking from the simple touch, made worse when another moan slips out from you—one that has Katsuki scolding you. His whispers aren't much whispers with how deep his voice is, allowing the words to travel throughout the room a lot easier than yours. Still, no one seems to stir; no one but Eijirou.
He drags his hand down his shaft, using his building precum as lube to stroke himself. Slow and steady, all the motion is in his wrist. It's unlikely either you or Katsuki will be looking at him but if there's any kind of movement coming from his direction, then surely someone will notice. It's almost painful how slow he's forced to move, the awkward angle on his side has him bunched up, and the awkward movement of his wrist is already tiring him out.
Still, hearing and thinking about what was happening behind him is undeniably delicious. Sure, he's jerked off thinking about either of you on random occasions; Katsuki is a handsome man and you're equally as attractive, but it's never been anything beyond that. Just appreciation over his friends and pleasuring himself privately when there's nothing else on hand.
This? Hearing you guys kiss, fuck, and moan into each others mouths while pleasuring one another right next to him? It has him lightheaded. Eijirou can only imagine the tangled mess you guys are placed in, trying to keep one another quiet but desperately trying to scratch that pleasurable itch that neither of you could deny. How warm your body would be, Katsuki's big hand holding your thigh in the air while buried inside of you, almost cock warming with how little he can move without making a sound. There's a pop that sounds off in Eijirou's head and the feeling of his teeth sinking into his own skin—shit, he bit his own lip a little too hard trying to keep himself quiet.
When he hears you guys moving beneath the blanket, at least more than you had been, Eijirou stops moving his hand, squeezing the head of his cock tight. Waiting with bated breath, he listens for you guys to settle again, waiting for that familiar sound of skin-on-skin. It soon returns, just as periodical as before.
Now, your moans are more muffled than before, your breathing slightly obstructed but also everything sounds even closer to him. Every little slip that you can't hold onto because Katsuki has hit your sweet spot is immediately intercepted, by what Eijirou can assume is Katsuki's hand. Eijirou mouths the word 'fuck' to himself at the thought, thumbing his slit as his hand rolls up and down his shaft.
Torture is the best way to describe this scenario. Eijirou's hips are beginning to twitch and his cock is throbbing in his hand, begging for more. Tears are beginning to brim in his eyes with how desperate he is, biting his hardened tongue to keep from giving himself away.
Katsuki seems to be losing control of himself too when the sound of skin slapping grows louder and faster, your breaths harsh against his hand, muffled and cut off whines that are barely contained in the small space between you both. It lasts only for a few seconds before it returns to normal, enough for Eijirou to try and match Katsuki's pace with his hand on his own cock.
"You're gonna wake everyone up," Katsuki whispers into your ear, breathy and absolutely dripping with arousal. It's a foreign sound to Eijirou and it makes his core ache.
You whine behind Katsuki's hand in response, a shuffling of your hips against the futon to have him keep going. Eijirou's mind is swimming with lust and need—even in the dark, he wonders just how pretty you'd look being pleasured. If Katsuki's cock fills you up enough or if you'd be willing to take them both. A sandwich with you as the filling between them.
Before he could stop himself, Eijirou moves on his futon, adjusting his position to turn over onto his other side. His eyes remain closed to keep up the illusion that he's asleep, but every sound you guys were making ceases instantly.
It takes all his strength not to smile.
The air is still with fear. Eijirou could hear yours and Katsuki's hearts stopping. Both of you frozen in time, almost caught in a compromising position by the person closest to you. Eijirou settles down, nuzzling into his pillow, hand still squeezing his cock underneath the blankets.
You were the first one to let out a breath of relief when you thought Eijirou had gone back to sleep. Katsuki growled low in his throat, forcing you to change positions again—one that would be less compromising and noisy.
Eijirou doesn't move again until he can hear you guys fucking, the sound of your thighs meeting is the quietest it's been, but it's still there. Instead, now, there's the addition of your pussy. Each thrust comes with the slick sounds of your pleasure coating Katsuki's cock, something that has Eijirou almost bursting in his hands instantaneously.
Since he was laid on his right side now, his dominant hand was tucked underneath his body and it was a lot more subtle for him to stroke his cock beneath the blanket. Eijirou takes full advantage and strokes his cock in fast, languid strokes to relieve some of the built up desire within. His cock was like a running faucet of precum, his hand and cock slick enough that he glided over himself with ease, thinking and simulating himself fucking you or Katsuki.
Daring to open one of his eyes, Eijirou is greeted by barely anything in the dark. It's pitch black but he can see two bodies before him, covered with a thin blanket that is moving up and down with Katsuki's hips. He's whispering things to you, likely sweet nothings in your ear with his face buried in your neck, a place that Eijirou can't help but be jealous of. Katsuki's tone travels but Eijirou can't hear what he's saying, only that your mouth is covered again with the desperate moans that keep slipping out between your lips.
Eijirou keeps watching you both, confident enough that you're so lost in one another you're not going to look over. Even if he can't see much of anything, it still gives him pleasure knowing it's real, seeing even a little of what's happening beside him. Somehow, his own cock isn't making any noise as he furiously rubs himself beneath the covers, covered in his own pleasure. It allows him to remain hidden, to keep going as he feels his own release coming close.
Then, a moan catches him by surprise.
He closes his eyes so quickly that if you and Katsuki could see him, you'd know he was awake. Squeezing his cock tight doesn't help him much, nor does the furrow in his brow or scowl of aroused frustration. Understandably, both you and Katsuki had stopped in your tracks again, breathing heavily and staring at Eijirou in disbelief.
It's quiet. Neither of you go back to your own pleasure for too long. Eijirou curses in his head, running his thumb over his slit to torture himself some more. He hopes you guys just pretend it didn't happen or think you'd mistaken one another for his sound. But Katsuki doesn't let go so easily.
"Red?" He calls out quietly. It's a whisper as far as Katsuki's standards go, quiet enough for only him to understand. It was an attempt to see if Eijirou was actually awake or, by chance, a wet dream.
Eijirou doesn't respond. He's too scared to.
After a few drawn out moments, you sigh. "Keep going," You whisper sweetly to Katsuki, "I'm almost there."
Maybe Eijirou's slip up was a blessing in disguise, because when Katsuki starts moving again, he doesn't seem to care what noises slip out between your bodies. Either he doesn't believe Eijirou is asleep or he's too horny to care, it's enough ammo for Eijirou to keep stroking his cock to completion—in his pants, of course, to avoid suspicious clean up.
His head swims in the throes of his orgasm, listening to both you and Katsuki finish a little after—surprisingly, no one else stirred from your careless noises. Not even when you were giggling with each other and kissing again did anyone else shuffle on their futon. Maybe Eijirou is the only light sleeper here.
He remains still when hearing you stand up again, bare feet padding out of the room this time. Eijirou half expected Katsuki to call his name again, to call him out on his bluff, but all he hears is Katsuki's light and satisfied breathing on the futon next to him.
"Here," Eijirou hears you whisper when you return, "Tissues to clean up."
There's a gruff "Thanks" from Katsuki before he yawns, earning a giggle from you in response before you share a casual kiss and your footsteps lead away to your futon on the other side of the room. Only then does he finally fall asleep, undisturbed for the rest of the night.
The next morning, however, Eijirou had to put on the best acting performance of his life. Katsuki can usually read him like a book, so he really had to pretend like he hadn't heard, watched and jerked off to your late night booty call in the middle of a mission. Eijirou believes he deserves an oscar since Katsuki never once brought it up since.