Thread by @Gs_sharp_knives

Wait, #bkdknsfw idea based on this..
What if Omega Deku who has a somno kink but he's in a relationship with another alpha.
Izuku thinks it's his alpha that cums deep inside him almost every night since he brought up the idea.

https://twitter.com/KTDK_Weeb/status/1615787762548117504

Every time he wakes up with cum leaking down his thighs or even spread over his pussy and mound he returns the favour to his alpha. The other doesn't know why sometimes Izuku 'thanks him' that way first thing in the morning but the sex is good so he doesn't care.

In reality its Katsuki who's been sneaking in Izuku's room in the middle of the night slowly sink into him and fuck him like no tomorrow.
Very recently he's taken up to fucking the nerd's mouth and finishing all over his face.

The first time Izuku woke up with cum all over his face instead of his pussy he was... disappointed in one way but the second his tongue slipped out and swiped at his lips his body flared up immediately.

His boyfriend must have /just/ been there.
The greenette is too lost on the ideas, the thought of being taken advantage of in his sleep that he barely notices the difference in taste as he swipes globs into his mouth.

His fingers work fast in his hole, plunging as deep as they can go, barely reaching his sweet spots. His other hand scraping his face and licking his fingers clean.

His body shudders and his lips grow numb as his legs shake and quiver.
This is the first time he came this fast just from fingering himself.
His hand swipes at the cum that drips down the side of his face, slowly bringing it to his lips.

He goes to shove it in his mouth again before hesitating, post but clarity hits hard, he's suddenly kinda disgusted for some reason, a reason that he quickly ignores because why not? It's sexy.

The moment the cum hits his tongue his eyes widen impossibly.
He shoots up in bed, sucking on his fingers as he searches for more information.
Much like one's scent, ones slick and sperm differs from person to person, and the jizz in his mouth definitely isn't his alpha's.

The shock turns into horror as he realises someone that isn't his boyfriend came into his room and came all over him.
Then the horror turns into arousal, quicker than the greenette is able to admit tbh, as he realises that he's been used by someone else, basically cheating on

His boyfriend.
Izuku can't really complain, every day he's woken up like this he's been in a great mood, clearly having reached orgasm by this stranger using him like a cock sleeve.
The more he thinks about it the greenette's hips start involuntarily grinding down on his bed

His sheets get ruined as he cums once again.
~~~fin~~
Should I continue this?

Izuku's body has been buzzing for the rest of the day. Everything in him is quivering as he thinks more and more about it.
He dreamily looks at the rest of the class, idly wondering who's cock he's been taking almost every night.

He wants to know who this mystery person is but at the same time the thrill of not knowing who's been sneaking into his room and using him is exhilarating.
He can feel his nipples rubbing against his shirt as his thighs clench and unclench.

He does realise that his enthusiasm and positive response to the situation basically means he's cheating but that just adds to his horny brain.
He can only imagine the way his boyfriend would react if he saw this other man balls deep in the greenette's cunt.

Fuck, he wants to finger himself right this second.
He's abruptly brought back to reality by Katchan's annoyed yelling.
"Hey nerd! Fucking, earth to Deku! You in there?" He snaps his fingers in front of Izuku's freckled face.

"h-huh Katchan?" That's right, what if it's Katsuki who's been knotting him all these times? His whole body shudders and his lips tremble. He leans forward as his back arches as if to get in a display position.
"Wh-whats wrong?" He blinks, trying to ignore the rising heat in

His face.
A blond eye brow arches in question as Katsuki looks him over.
"Lunch has started, get your shit and let's /go/" he grunts as he makes his way to the door.

Izuku's mind keeps on daydreaming, he should do something for the somno guy, but what?
A letter? Food?
Maybe he should write something on his cunt so the guy will see!
Or...no! Maybe he should shove a letter in his pussy an- wait those are horrible ideas.

His hands can't help but wonder as he leans back on his desk chair,
Would the guy be scared off if he knew Izuku knows? Would his nightly visits stop?
A scared hand grabs over his mound and squeezes hard, he needs to calm down.

His mind wonders off as a thought passes his mind, he knows what to do.

Katsuki does feel guilty. Not because he's been devouring Izuku without his consent, but because Izuku isn't his in the end of the night.

When morning comes Izuku will go and kiss his boyfriend, not Katsuki, and the thought alone makes the blond agitated.
He sneaks in the nerd's room as usual and sits on the side of his bed, admiring his sleeping form like always.
That's how it started actually,

He snuck in one night and stole a kiss, then it snowballed from there.
Just like tonight, Katsuki leans down and captures the greenette's lips with his own.
It doesn't take much for the blond to get riled up and start touching Izuku all over.

He breaks the kiss and slowly and steadily undresses the man, taking his shirt off before reaching for his pants.
Slowly he pulls on the fabric, the question on his mind is quickly answered by the image that greats him.

The little nerd's pussy is cleanly shaven and instead of underwear he's only sporting a pussy sticker.
Katsuki groans, his dick twitching in his pants.
His forehead rests on Izuku's smooth mound as his fingers dig into supple thigh.

He can feel his fangs extending and his mouth flooding with mating venom.
"F-fuuuuuck" he groans. Deku's gonna be the death of him.
He throws their clothes somewhere on the floor before he burries his face between Izuku's thighs.

He spends a solid five minutes just taking in Izuku's scent. Even through the slick sticker he can clearly smell the nerd's arousal.
He ruts against the bed as he starts lapping at the sealed pussy, drool and venom sliding and making an absolute mess out of that smooth mound

The small huffs and whines and whimpers slipping form the smaller man drives Katsuki crazy, his dick leaks precum on the greenette's sheets, probably ruining them but he couldn't give less of a shit.

His licking and sucking becomes hectic, the sticker not budging as he slobbers and pushes Izuku closer and closer to orgasm.
Thighs tremble around his head as a long whimper slips from the greenette's throat.

The blond's mouth detaches from Izuku's pussy and Katsuki rearranges himself.
He grabs Izuku's legs, slapping his fat cock on the greenette's abdomen, a pleases huff slips from him as he sees his tip reaching the boy's bellybutton.

He pushes Izuku's legs together, squeezing his thighs around his cock before he starts pounding away with reckless abandon.
The room fills with lewd sounds, like every night.
His balls clap against Izuku's plump ass, groans and heavy breathing comes from both men

as Katsuki overstimulates Izuku's pussy as.
The bed creeks as the blond picks up speed, his knot expanding and slipping between freckled skin.
His muscles bulge as he sinks his fingers in Izuku's legs, he slumps forward and moans as he knots those freckled thighs

Ropes of cum keep spilling over the greenette's abdomen, pooling in his belly button and spilling over his sides as he steadily breathes.
Katsuki gently kisses along Izuku's calves and feet as he calms down from his high.

~~tbc~~
This is a nsfw account. If you follow and you don't have an age in your bio, I'm blocking you instantly 🤠.
I'm not joking.
Put the age in you bio before you follow.

When Izuku woke up he was drenched in all sorts of liquid.
Sweat and cum being the main ones.
His new sheets were ruined again but the greenette couldn't care less as he absentmindedly slurped on that milky white substance.

His hand finally reaches his cunt and is surprised to find the sticker still on. He wouldn't have minded if the alpha tore it off, but he obviously enjoyed the play.
'what a good alpha' he absentmindedly thinks as he slowly pulls the sticker off.
~~~

Izuku's boyfriend has started wondering.
The greenette has stopped coming over to his room in the mornings to have sex but he seems to have that same aura around him like he's been thoroughly fucked.
Something's not adding up for him
~~~

The next thing Izuku did for his nightly visitor was a bit expensive.
It was his first time going shopping for lingerie, gosh they're were so many options!
He spent a lot of his time trying to figure out what kind of sexy outfit the mystery alpha would like.

His mind kept wondering from classmate to classmate as he looked at the different sets of frilly, frumpy and lacie pieces in front of him.
But he kept circling back to one alpha.

Maybe it's the thought that gets him going, the truth he doesn't want to admit, and the sweet delight that comes with not knowing the mystery guy.
Izuku could very well figure out the guy's identity, simply putting up a camera in his room would do the trick.

But he wanted that ignorance, he wanted to wake up each morning and imagine it was Katsuki who ravaged him every night, even if he knew this couldn't be true, he wanted to fool himself even for a moment every day.

Izuku walks out of the store with the perfect set of lingerie and a plan in mind.
~~~

Katsuki's addiction is getting worse by the day. Izuku's sweet pussy is a drug the blond is not willing to just part ways with.
Tonight too, he's creeping into the greenette's room.
There's something different about Izuku's sleeping form though, and Katsuki can't place it

He touches the omega's cheek, almost checking, but he already knows the boy is deep in sleep.
He captures the greenette's soft lips with his own, his hand slowly making it way down, caressing every bit of skin it touched.

The man lapped at Izuku's neck, licking and sucking softly over the boy's swollen scent gland.
His hand grazed over fabric he couldn't make out, until he came across something harder than skin or fabric.
Pulling the covers back Katsuki groans at the sight.

Lace and cotton wrap around and hug Izuku's figure in a mouth watering way, he's wearing fucking lingerie.
Then he notices. It's a letter, well, more like a piece of paper, gently laying on the greenette's stomach.

Katsuki hesitantly opens it and his stomach immediately drops.
"I know you're not my boyfriend" was the very first thing written on there.
But the rest of the letter surprised the blond even more.

' I've known for a while and I must admit, turns out I'm as big of a pervert as you are, whoever you are.
Every day I've woken up and stuffed my pussy with the thoughts of someone I don't know fucking me in my sleep.
Your cum tastes good by the way, way better than his-

So why don't you fuck me silly while I'm awake yes?
I'll blindfold myself and if you want your anonymity, I really think we'll have good fun together'
Followed with a question
'do you want to? yes or no?'
Katsuki gets up from the bed and rips a pen from his desk

He almost tears the paper when he circles the 'yes' written there.
He then stalks over to the sleeping man and rips his pants down just enough for his throbbing cock to flop out before spreading Izuku's legs wide open and fucking into him with reckless abandon.

The next night Katsuki sneaks in Deku's room the greenette is sitting on his knees, blindfold abstracting his beautiful green eyes as he patiently waits.
A small gasp escapes his plum lips when he hears the slightest creek of the balcony door opening and cool air flowing in.

"y-you came!" He says almost surprised, rubbing his freckled thighs together as he shifts on the bed.
The floorboards squeak and creak as Katsuki makes his way towards the bed
"I honestly didn't think you'd come! I mean, I thought you'd be scared that I caught you,-"

"so you'd run awa-" Izuku's words are eaten away by this stranger who has now captured his lips in a heated kiss.
"Hmn!" The greenette whimpers as he kisses back arms reaching out, following the hands that grabbed his face and up his arms, slinging his own over the mans shoulders

The mattress dips under the others weight as he gets on the bed, his hands, warm and big, departing from the greenette's face to travel down his body.
Katsuki slips his hands in the crooks of the man's knees when Izuku lifts himself to continue their kissing.

The greenette moans against the foreign taste of lips he hasn't tasted before. He's lifted into the other's lap, his pussy lips spreading over the huge bulge under him.
He can't help himself, Izuku moans whines and keens louder than before as he starts grinding against the bulge

He breaks the kiss and the stranger is immediately on his neck, kissing and lapping at it like a starved man.
"Hmm fuck! You're so fucking hard already baby. Are you ready to fuck me?" The greenette mumbles drawing grunts and hums of approval from the other

"you're very lucky you know that?" Izuku mumbles "I didn't report you and you get to find out my little secret!"
At that Katsuki chuckles, no matter what would have happened, he knows for a fact Izuku wouldn't report him he loves him too much.

"hey, since all the balls are in my field, you don't mind me moaning the name of someone else right?" His cock high state is giving him incredible courage as he soaks the man's pants with his slick.
"But first, I want your cum" he giggles getting off of him.

Izuku's hands run down the man's torso only stopping at the waistband of his pants.
Katsuki hasn't even processed what his childhood friend just said about moaning someone's name let alone the fact that the lips he was just devouring were now mouthing at his cock.

Izuku pulls down the waistband and something large and stiff slaps his cheek, making him giggle as a result.

He goes to grab the cock on him when those large hands grab his wrists. Izuku stops for a bit as the other shuffles and huffs, then his hands are placed back again on a naked body this time.

He waists no time, his hands going straight for the guy's crotch.
His mouth parts as he grabs the base, he can hear the way the man's breath catches but he can also feel his own trembling one escape him.

His fingers barely touch as he wraps his hand around the base, he hesitantly pulls his hand up, up, up until it finally reaches the spongy tip of his cock.
Izuku swallows thickly before unintentionally moaning.

"Fuck! how did you shove that in me!? Did - did you put it all in?" The greenette mutters as he lubed the start of the guy's dick with his own precum.
Katsuki chuckles a little bit before taking a scarred hand and dragging down before stopping a few inches before the base.

"Is- is this how much you put in me? Holly shit I'm actually kinda impressed with myself" an amused chuckle escapes the greenette.
Izuku doesn't spare another second talking as he brings the tip on his lips, kissing softly before slacking his jaw and swallowing down as much

as he can.
His whole face starts hurting and hes not even half way down that huge cock. He can feel his throat spasm and his jaw aching, it's really a difficulty to deep throat that monster of a penis.

He tries again, this time a bit more successful as he wiggles down the shaft. His hand reaches out, making a grabbing motion and the man thankfully responds.

Izuku places the man's hand on his head urging him to push down, he can hear a groan as another hand threads through his fingers and both start pushing on Izuku's head while at the same time his hips move ever so slightly.

The greenette moans as his throat is split apart steadily. He's almost at the base when he finally taps out, his hand gently squeezing on a sculpted thigh.
Katsuki thinks he's dreaming, since the moment he stepped inside the room till now, he's convinced it's a hallucination

at best.
He almost cums on the spot as he watches Izuku down dis dick with little to no help and again as he watched his cock flop out of that mouth, the greenette's lips stretched red and bruised as his mouth hangs open for air.

He licks his lips before popping the tip back into his mouth and sucking roughly. Izuku bobbs his head over the top of Katsuki's cock as he works the rest with his hand. He leaves open mouthed kisses down the length of It, his thumb digging into the slit as he reaches Katsuki's

heavy balls.
Moans vibrate through the blonds skin as Izuku sucks on them, the blond tries hard not to cuss or speak at all for that matter, only allowing himself to grunt and moan. His breathing fastens and his hand clutches tight onto green locks of hair.

Izuku detaches himself with a pop from the guy's balls before reattaching himself to his cock. The omegas body trembles, arching his back and spreading his legs Izuku cums the second that hot liquid touches his tongue.

He sucks on the tip like a straw, eagerly drinking down every single drop of cum that slips out. His mind blank as his senses fill with that familiar need, he can barely hear the guy on top of him moan and whine as he's rudely thrown into pre-heat.

When the flow of cum stops Izuku detaches from the still hard cock of the man, a pleased pur escaping his throat as he kisses up a well sculpted body. He can feel the spit and slime covered cock dragging along his body as he travels up wards, latching onto a nipple and earning a

moan before continuing on.
Izuku gently nibbles against the man's neck as he places his dripping pussy lips over his cock.
"You're sending me into heat" he moans whispers against the strangers ear before sucking on his earlobe.

The next thing he knows he's flipped on his stomach, large hands lift his hips and spread his legs in a presenting position as slick gathers at his clit and drips down into the sheets.
He squeaks as he feels a mouth on him momentarily, slurping up anything he can with his

his tongue before he gets up.
Izuku whines at the loss but quickly rejoices as he feels his entrance being poked with something thick. He already has an idea of what to expect but the thought of the size still makes his pussy quiver in fear.

At best he hopes to not end up in the nurses office.
His pussy is spread open with ease, the man's huge dick sliding inside like it's his home, pushing Izuku forward with the intensity of the thrust. A large body drapes over him, hugging his arms and kissing gently against his

shoulder.
The greenette's pussy contracts and squeezes around the cock buried deep inside him but just when he thought thats it the alpha on top of him pushes even deeper. The scream escaping his lips hushed with a large hand placed over his mouth.

The omega under him shakes violently as squirt drenches Katsuki's thighs and everything under them. The blond is ready to cum too, Izuku's hole is worlds apart from when he's sleeping to now. Hell everything about it is different.

The reactions, the sounds, the responses. Katsuki doesn't think he'll be able to survive without the omega's... everything! He cant survive without the omega now. He screwed up and he knows it.

The blond's hips thrust involuntarily, digging deeper into the greenette's guts and drawing a hiss from both.
Katsuki's about to start thrusting by himself when the faintest cries slip from between his fingers, where he's covering Izuku's mouth from waking up the students in the

other rooms.
"Ah fuck! S-so big! I can't! You'll break me you'll break me! Kah- Katchan please! Fuck me!"
Katsuki's whole body freezes. His eyes feel like they're about to fall from their sockets as Izuku continues mumbling into his hand.

. A mantra of "fuck me fuck me"'s tumbles out of the smaller man as he weakly shifts his hips, trying to push back into Katsuki's cock.

That seems to snap the alpha back into reality. He pulls back, unsheathing most of his cock beforehand slamming back in, the resulting scream from the greenette like music to his ears.
"Fuck Izuku" Katsuki growls but before the omega can what's happening

He draws back out but before he slams in Izuku's flipped on his back, still on Katsuki's cock as his mask is ripped off.
Green teary eyes widen as he stares up at the now familiar man.

"Ka-katchan?" He manages to mumble before his body washes over with an all too familiar sensation. Katsuki slams back in as Izuku cums from the sight of him. Head thrown back, legs trembling and pussy quivering, Izuku is almost unconscious as he screams in ecstasy.

He doesn't have time to recover as his wrists are taken, his arms pulled on as Katsuki slams into him again and again, his cervix kissing the tip of his childhood friend's penis as he's fucked withing an inch of his life.

Izuku can only watch the man he thought he could never have chase his release using him. The thought that Katsuki has been the one who came to his room every day, used him like a sex toy despite him having a boyfriend and leaving him a mess of cum and sweat sends him straight

into another orgasm.
I guess that was the appeal all along for Izuku, not the thought of some random stranger using him, but the possibility that it could have been Katsuki who wanted him when no one would be awake to witness him.

The alpha looks like a god, a wet dream that came to life, as he growls and fucks with reckless abandon. Eyebrows furrowed and gase concentrated on him, sweat covering his whole body, dripping down from his chin and nose onto Izuku.

Izuku who's a mess, mumbling absolute nothingness, body pliant and sitting useless. The greenette berates himself for not helping Katchan find his release but he cant do anything, he can barely feel his legs much less fuck back on Katsuki's monster of a cock.

The blond's hips finally stutter, a fat knot beginning to form and catch on Izuku's entrance, but before they stop completely he attacks the omega's clit, thumb digging into it before rubbing with fury. Izuku's lips are bloody as and his neck exposed completely as he screams agai

Katsuki couldn't give two fucks about who's listening, he covers the greenette's body with his own once again as he moans sweet nothings into his ear.

Cum paints the omega's cunt white as a knot finally pops into place, locking them together as they catch their breath. Izuku's body falls lip as he turns his head towards the blond, lips parted and waiting.

Their kiss is messy and sloppy, squelching sounds traveling through the room and gracing their ears.
"How did you know it was me nerd?" Katsuki huffs as he kisses down Izuku's neck again, licking at his Adam's apple.

"I didn't, I just wanted to pretend it's you" his arms sling over the blond's broad back as his fingers thread through a mess of spiky hair.
Katsuki kisses him again tugging at the knot connecting them and drawing a whine.

"Should've known you wanted me Deku, could have mated you a long time ago." He teases with a nibble of Izuku's scent gland.

"Hmmm, what's stopping you?" The greenette caresses Katsuki's back, reaching down and squeezing an ass cheek, pushing him forward and digging his knot deeper.
With a growl Izuku can feel teeth sinking into his flesh, venom being injected into his blood stream as he's claimed.

Oh. Now he's totally done it.
~~~fin~~~

Izuku breaks up with boyfriend obviously.
Bkdk do get judged hard for what they did but class 1A get over it over time.
That's all

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