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After a rough night at a party, Izuku wakes up naked in an unfamiliar room with a dragon hybrid staring at him. He's naked and in a half form. "Now. I'm sure you're wondering why you're naked and in an unknown room with an unknown naked dragon hybrid talking to you. But I assure you, I am just as confused."
"What the fuck?"
"Can you two shut up, I'm trying to sleep! ... Wait..." The three stare at each other in confusion silently. There's a blonde with red eyes, very muscular who is also naked, who just woke up. Both are very handsome but uh... WHAT THE FUCK HAPPENED?!
"Okay. I remember going to a party... getting a little drunk, not much, and then it goes blank."
"I remember a party, getting totally hammered and blank." The blonde says.
"And I remember a party, getting drunk, and... um... wait... what is that on... your neck?" Everyone freezes. Izuku quickly grabs both sides of his neck to feel bite marks. "AH SHIT!!" The blonde yells. "I DON'T EVEN KNOW YOU TWO?!" Izuku screams. "WE DON'T KNOW YOU EITHER!!"
"FUCK is there a way to take it back?! Oh shit, my moms are gonna KILL ME!!"
"Your parents? My hag will have my fucking head on a stick for all to see!!"
"My mom is gonna cry... I'm sorry mom!!!" Izuku starts sobbing and the two alphas look alarmed. "Woah woah woah! Don't cry! Fuck! We need... uh... we need to find someone who remembers last night! Maybe, just maybe! It's not us who marked you!!" The blonde tries to figure things out. But the dragon speaks up. "UH, DUDE. WE'RE ALL NAKED IN THE SAME ROOM, I'M PRETTY SURE WE KNOW WHO DID IT!!!"
"Oh my god, am I going to get pregnant?! With two strangers?!"
Suddenly, the door opens. All three turn their heads and shut up. "Midoriya?" Todoroki Shoto. Thank the gods. "I appear to be interrupting something, I'll go ahead and-"
"NO NO NO!! STAY!!" Izuku freaks out and tries to find his clothes, prompting the two alphas to follow. "Just give me a second to find clothes!! WHERE THE FUCK ARE MY CLOTHES?!"
"Oh, I found them out in the dining room, here." Todoroki hands Izuku torn up clothes stinking of both alphas. "I don't think you can wear them though..." Izuku stares blankly, trying to process this.
Izuku woke up naked, saw two also naked alphas with him that he did not know, with two mating bites on his scent glands, and no memory of the night before.
What the fuck?
After finding Izuku some clothes, the alphas getting dressed, and some good old awkward silence, they try to get to know what happened. "Well, the party was great. Lots of people got laid, that's for sure. I think Kaminari laced the punch though, so everyone got drunk or high. I lost track of Midoriya around midnight and found your clothes this morning."
"My fucking god. I'm gonna kill that bastard." The blonde growls.
"So, because Kaminari laced the punch, the three of us got high/drunk and fucked each other? I fucking lost my virginity to two strangers?!" Izuku starts to panic again.
"Okay, so like, when my moms find out, I'm probably gonna be like- skinned alive. So... you know, you won't have to deal with me!" The dragon smiles nervously, laughing grimly.
"My mom is gonna have my head on a stick, so you won't deal with me either." The blonde replies.
"You should all three at least know each others names..." Todoroki suggests. Izuku takes a deep breath. "The soon-to-be-late Midoriya Izuku."
"The dead man walking Bakugou Katsuki."
"I don't have a clever saying that I'm going to die Kirishima Eijirou."
...
"Now what?"
"Now, we contact our parents..."
"SHIIIIT!" Bakugou groans. Todoroki gives all three of them papers to write letters to their families, inviting them over for a "big reveal". "This sounds like a pregnancy announcement."
"It might be." Izuku replies with a shrug.
"Fucking perfect."
Within two days, the parents have arrived and are VERY confused. "WHO THE FUCK IS PREGNANT, BRAT?! Also... INKO?!"
"Mitsuki?!"
"Why is the head of the Bakugou clan here?! And the Kirishima clan... and... I don't know you... so..." One of the dragon women says. "My name is Inko. I'm nothing of importance."
"Oh, okay." She replies.
"Mom!!" Izuku shows up in a turtleneck sweater. "Honey. What the actual fuck is going on here?" Izuku looks shocked as he's never heard his mother curse before. "Hehe... well... we'll explain!"
"WE?!" All of them ask.
There the three boys stand in front of their parents with nervous expressions. "Bakugou Katsuki, I swear to God, if you did something stupid- UGH! I will have your head!!" Bakugou whispers to Kirishima, "Told ya." Kirishima gulps. "Eijirou? Explain." His mothers glare as he starts to sweat. "Izuku... honey..." Izuku smiles nervously and is shaking.
"They all three woke up naked in the same room, Izuku has two mating bites belonging to both Kirishima and Bakugou." Todoroki walks in, putting down some tea then leaving quietly. The three boys brace for impact.
"... Katsuki... I said if you did anything stupid, I'd have your head. Correct?"
"Yeah..."
"Did you do something stupid?"
"Yes..." Katsuki plays with his nails. "And? Do you apologize?" Katsuki looks up. "To who?"
"TO EVERYONE!! Izuku, his mother, me!! ALL OF US!! BOTH OF YOU FUCKED UP!! AND IZUKU!! WHAT THE FUCK DID YOU DO?!"
"To be fair, Kaminari laced the drinks." Izuku whimpered. "I didn't drink much alcohol, it was the non-alcoholic drinks that were laced with drugs..."
"So, let me get this straight..." Inko speaks up. "You three slept together while drunk and high and are now mated for life? Because your friend laced the drinks?"
"Yeah, basically." Kirishima answered with a shrug. "Did you at least use protection?" Inko's eye twitched. "The way I woke up? No." Izuku confessed. Inko takes a deep breath. Causing the room to go tense. "Okay... Izuku. If you get pregnant... what do you THINK will happen?!"
"I'll be left alone with a pup or two to take care of on my own and be forced deeper into poverty?"
"Correct."
"Woah woah woah, hold on! Who said we'd leave him alone with the pups?!" Bakugou speaks up. Kirishima looks equally offended. "Yeah, we'd be assholes! Hell no!" Kirishima adds. His parents are next to speak. "Oh, so both of you boys will be taking care of an omega and pups all on your own? YOU'RE 16!! You couldn't even take care of yourself, Eijirou! You expect to take care of pups and an omega?!" She yells. "You know, technically, we could learn." Bakugou points out. "I mean- we'd have to eventually seeing as we're all family now. And if Izuku is pregnant, we won't have much of a choice. We ain't gonna leave him. At least, I won't!"
"I wouldn't either!" Kirishima adds. Mitsuki sighs, "So, this means the Kirishima and Bakugou clans are merged as well as having Inko and Izuku join the mix? Not to mention two alphas sharing one omega? This... sigh... is not ideal."
And thus, from then on, the two clans were merged and Izuku was introduced into the new clans, becoming the wife to both Katsuki and Eijirou, as well as co-leader of the clans. It took a while to adjust, as well as many dates to get them to work well together, but they actually learned that they didn't regret mating. All three of them, whether due to the bond or otherwise, found each other great to be around. And would even say it was love. Katsuki loved Izuku's freckles and threatened to use a marker to create new constellations on his face. Kirishima loved how manly both his mates were, both strong-willed and bullheaded in their own right. Izuku loved Katsuki's red eyes and ferocious nature, and Eijirou's kindness and love. And lets just say the bedroom? Was FUN. Izuku has never felt so good.
Luckily, Izuku did not get pregnant the first mating. But did soon after moving into their new home.
They all lived Happily Ever After,
The End.