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Up until he was ten, Nobita believe that he will present as an Alpha and finally got his strength. He has always been weak and frail, his male peers bully him so often that he will only manage to play with girls his age.
Shizuka, his classmate and neighbour always protect and take care of him that he develop a crush on her.
He vow to marry her. He believe that Shizuka will be the perfect omega wife for him one day.
On his twelve birthday where he suppose to present, Nobita still have no subgender.
People his age call him a broken boy.
Shizuka who present as an omega become closer to the perfect alpha guy in his class, Dekisugi.
Since they were younger, Dekisugi has always been reliable and a hardworking genius that was kind and genuine. Nobita resented the fact.
He would ignore the alpha when he try to become friend with him and leave Shizuka house whenever the other come over.
As everyone grow into their respective subgender and begin to find their place in the world. Nobita remain the broken boy with a boring life.
He pick up part time job at a library around his house when he turn nineteen, he could not find a decent job since people alienate him, thinking that he was no useful to society.
"Hey wake up! Nobita!" He open his eyes lazily, disturbed by the sound. It was none other than Dekisugi, the guy that own the library.
Nobita refused the job but the alpha convince him that he still need to hold himself up even if he broken.
He has to woke up at 6am and start working from 6.30am to 9pm alone. The library is big and full of various book, so Dekisugi would ask him to re-shelves and clean everyday.
During lunch and dinner Dekisugi would provide him a nutricious bento, and they will have to eat together. He was told to finish it if he want to keep his job.
Nobita hate it, the food always taste bitter to his liking and the juice he have to drink was always a little slimy.
"It's lunch time." Nobita nodded, standing up straight so that Dekisugi can check his body. Since he was broken, the alpha said that he need to be pat down everyday because he was afraid that Nobita will steal anything from his place.
Dekisugi squeeze his chest hard, making him wince and back away.
"Stay still." He trembled, somehow over the years the alpha have become meaner and rude towards him, always ordering him around and talk down to him.
"Bend over." He have no other choice but to obey, resting his arms on the desk as the alpha fondle his ass in earnest.
"Your ass and tits so fucking big now, thats good." The alpha land a harsh slap on his ass making him yelped in surprise, he closed his legs together but Dekisugi, shove his face down with one hand and continue his assault.
"Stop moving."
Nobita begin to cry, hurt and scared. He been pat down everyday but never to this extent, it's like Dekisugi was purposely trying to humiliate him.
"I-i.." His body start to heat up, he feels dizzy, Dekisugi hands continue to wonder around his body, touching his thigh, squeezing his calves, pulling at his nipples, slapping over his dick and rubbing his asshole over the clothes.
"W-wait why.." He trembled in his hold, confused at his own reaction. He never feels so weak as he slid down and rest his back on the desk, looking at Dekisugi who tower over him with a menacing glare.
He feel trapped, realizing that the door was locked and they were alone.
"It finally working," Dekisugi squat down to his eye level, a small smile on his lips as he wipe the tears on Nobita's face.
"Congrats, you are finally an omega."
"What? Stop joking around!"
"I didn't?"
"B-but how..?"
Nobita rake his brain to find for any hints that he had missed, he never once develop a height sense of smell, never have curves, never produce slick and experience heats. To him, it proof that he have no place in the world.
"Actually, you are a beta, that's why you never present. Our society have never accept beta, they are deem as worthless because beta can't breed or produce."
He blinked his tears in shocked, no one have been taught about beta subgender.
"I don't mind you as a beta, but you keep avoiding and hating me. I don't understand at first but I realise it because you want to be an omega right? so i make you one." Dekisugi smile brightly, finger gently combing Nobita's hair.
Nobita froze, it's like the air has been knocked out of him as he trembled and cry a broken sound.
"No, no, no, no!" He hug his knees and push Dekisugi hand away, "I-i don't want to be an omega! What are you talking about?!" He screamed, feeling hurt and betrayed.
It all happen so fast, the air suddenly got tense and a foul spice smell full of anger and jealousy start to suffocate him, he look up to see Dekisugi fixing an intimidating glare towards him. Shiver run down his spine as he realise that he have made the alpha mad.
"Why not? You want to be an alpha? Want to be with Shizuka?" Nobita shake his head as more tears cascading his cheeks.
"You are so fucking stupid, always holding onto that idea,"
"What do you mean..?" He scoot backward, heart beating fast.
"You are just a lousy little beta, you can never be an alpha with that weak body and that dumb brain."
Nobita shake his head, refusing to hear more of the insult.
"Come on, how are you going to take care of an omega? That's why you should be one."
"Stop it, shut up!" He yelled, frustrated and resentful at the truth.
"It's okay, I can take care of you." Dekisugi soften, offering a gentle smile as he stare at the alpha in confusion. As realisation kick in, he feels himself becoming angry at the circumstance the alpha have put his through. If not because of Dekisugi he will just be a normal beta.
"Fuck off! You piece of shit! Go die!" Nobita angry rant come to a halt when Dekisugi goes quiet and the air tense again. He blinked and nervously bite his lips, fear engulfing him.
"I-im sorry, I—"
His words was cut off when Dekisugi surge forward to grab his waist with one hand and hold onto his jaws harshly, he whimpered as he was forced to make eye-contact with the angry alpha.
"Marry me Nobita." He cried, holding onto the alpha wrist with trembling fingers.
"I am a capable alpha, i can take care of you."
"But I d-don't want to.." He tried.
"Then should I just rape you here and knot you with my cum? Hmm?" The hands around his waist slide lower to his ass and Nobita try to remove it, panic at the threat.
"D-dont.. No, please.." Dekisugi continue his ministration as Nobita struggle against his hold.
"No please, stop! stop!" The omega pleaded as he look into Dekisugi gaze for mercy.
"Then are you gonna marry me?" Dekisugi gaze turn so soft that Nobita was sure that the alpha is not even mentally stable.
"I can take care of you, I promise I will be gentle once we have sex. We can have a lot of pups and you will get everything you want."
Nobita have no other choice but to nod. Tears still withering away as Dekisugi hug him in happiness.
Nobita dreams of a perfect family where he will be shower with love and care. He held onto the vague fantasy for so long until he present as an Omega.