My omega

Rut?!

 NSFW 
Dekus Pov

Kacchan and I sit down around some cherry trees, we sit together and eat, chatting occasionally and quietly, we don't want anyone to find out where we are because then they will just ask questions, and we don't wanna answer questions.

After a while of eating, lunch is done and we start to walk back to class.

On our way back Kamari walks up to us "where did you bros go?"

"None of your business dunce face," kacchan says

"awww but I wanted to ask questionnnssss"

"exactly why we didn't eat in the cafeteria" I butt in

Kacchan giggles next to me and I give him a small glare and he stops

I pat his head and whisper to him "good omega" and he blushes like crazy ahh he's so cute.

There's one thing I haven't told him yet though..

My ruts supposed to start soon.

Ruts usually line up with your partners heat but because I just marked him they haven't lined up yet... meaning that he will either not be able to see me or he will have to help me.

"Deku kun... you're mumbling again" ururaka comes up behind me and says adding on "oh but it's okay~ you can spend your rut with me, you don't need him"

"Ururaka I'm sorry but no. Katsuki is my omega I'm not gonna sleep with someone else"

Kat has tears in his eyes and mumbles "I-it's okay if you w-wanna spend your rut with her t-that's fine"

I hug him tightly and whisper to him "love I only want you, I don't want ururaka nor will I ever want anyone else."

He cries into my chest a bit and I pick him up and walk to my dorm, deciding to skip class as my rut would usually start sometime between now and tomorrow

Once in my dorm, I set him on the bed "love I'm sorry about her.."

"I-it's okay alpha I-I understand" he reply's

I go to my closet and grab out some fresh clean clothes for the both of us and hand kacchan his and he slowly starts to change as I do the same

"Kacchan" he looks at me and I smile "daddy loves you, my baby boy" 

He giggles happily and replies in a baby voice "I love chu too dadda!" I giggle and hug him and he whispers "mine"

"Yes prince, all yours"

He giggles happily "chu sure? not lies?"

"yes, baby boy I promise, no lies" I cuddle him closer and get a whiff of his sent... sending me right into rut.

"dada what's dat smell?" he asks smelling my rut starting. Unlike omegas heat where it starts slowly, alphas go right into it, needing friction imminently.

I let go of him and he whines as I stand up "i-ill be right back I'm gonna go uh potty real quick!!" I say as fast as I can. I run into the bathroom and lock the door, hearing my omega whine just sends me further down the spiral, I want to fuck him... to dominate him. I want so badly to open that door and fuck him till he's screaming my name and has multiple loads in his ass but I can't... At least while my baby boys out.

I grab my fleshlight and pour some lube into it and quickly start thrusting it up and down on my sore cock. It hurts but it feels so good to have some relief. It's not enough though, I know it so I yell out "baby boy"

"yesh dada?" I hear him crying lightly on the other side of the door 

"can you bring out big you pretty please" I grunt lightly "I need him really badly right now and I don't wanna hurt you"

"Its okay dada" he stands up and tries to open the door "Dadda let me innnnnn!" 

"no, go big and i will"

"No its fine dada you wont hurts me!"

"baby please ill give you candy later"

he takes a deep breath and sighs a bit before he goes big and knocks on the door "alpha please let me help"

I get up and quickly unlock the door before picking him up and shoving him down on the bed, quickly pulling off his clothes and biting his neck as I do so.

katsukis pov

"a-alpha!" I yelp, supprised by his actions, not even knowing he was horny, let alone in rut.

"you're so fucking cute" he growls at me "i just want to devour you!"

"t-then do it alpha! Take everything you want!" i shout without even thinking

suddenly I'm flipped over and I can feel my alphas thick cock plumming into me at a brutal and rough pace, no prep or any lube, just whatever slick I've created and the lube left on him from 'playing' with himself 

suddenly he hits a spot that makes me moan very loudly 

"oh~ looks like i found my little omegas prostate" he starts slamming into it making me fall onto my head giving him the ability to push it further into the bed and fuck me harder

"Such a good little omea slut~ Just stay like that and cum for alpha" almost on command i cum and he slows down a bit, thinking he's gonna stop as I start to catch my breath

He pulls out fully before slamming all the way back into me "you dumb slut~ you didn't think you were done did you!"

I nod my head as much as I can but i struggle

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hahahah okay end of chapter sorry I'm gonna skip the rest of the smut uh sorryyyyy