Write a very long and detailed story using every single one of the following points.
Make a backstory and a bad ending where Ochako makes him go through penectomy and castration and gets pregnant from a bull and decides to keep the child, while Izuku has to raise the bull’s children with her. Izuku Midoriya was still a virgin when Ochako Uraraka put him in chastity because he was very short. She told him this was the only way if he ever wanted to have sex with her. She promised to give him a release sometimes and jerked him off till he came when she did. As the time passed, the release gaps got longer and longer until she finally decided to make his chastity permanent. She said he’d been a good boy and she’d finally have sex with him. He got excited to finally lose his virginity and find out how it feels to be inside of a woman, but her plans were different. She showed him a double-sided dildo and said that this was the only way she would ever have sex with him, because any guy this short is a female, and should be treated as such. With one end of the dildo in his ass and the other in her pussy, they both started riding it. He felt bitter and betrayed, but it all felt too good, so he couldn’t resist and exploded with cum. She said that now that he knows how to sissygasm, there’s no point in ever releasing him. She flushed his key down the toilet and glued his lock shut, so that his clitty would stay locked, denied and frustrated for the rest of his life. He begged her not to do it, but she didn’t listen. Then she said that since his pathetic clitty was finally permanently locked, it would be unfair to deny her the pleasure of being fucked by a real cock just because he’s denied, so she was going to start fucking other men whenever she wanted to. Not only that, she said that a loser like him is not fit to be a man and no woman would ever want him, because he’s so short that he would make a much better girl himself. She told him to give up on that tiny bit of masculinity he had and be a gay bottom for tall real men, so he was to have sex with them too from then on. She also made him take female hormones to give his body a feminine shape and make him grow boobs, so that it would be easier for him let go of his manhood and accept his new life as a denied sub. She started inviting bulls to fuck them both and making Izuku suck their big black cocks and swallow their cum, then take them up his boypussy and let them cum inside and fill him up. She loves it when a bull slaps his helpless caged clitty with his superior cock before entering his boypussy. She likes to play with his frustrated locked clitty and balls using her tongue and fingers, while bulls fuck him. Also she likes using his cage as a handle when she’s getting fucked by bulls. He must clean all the cocks and Ochako’s pussy every time with his tongue, but for him no cleaning is allowed. The only way he is allowed to have sex with her is by using a double-sided dildo and the only way he is allowed to cum is from anal. He is constantly frustrated and hates his new life, but he can’t do anything about it. His dick has never been in a pussy and it’s never going to. Now he is a female himself. He serves real tall men with real cocks with his mouth and pussy while his clit is locked in a cage and constantly shrinking