Char Genie prompt

Write a very very long story about a school girl who can only orgasm when she is rupturing the testicles of a boy in her tight grip while she is rubbing her clit to ecstacy, She finds a boy who has a ballbusting and castration fetish who agrees to do some roleplay with her, but makes her promise only to pretend, and to not actually rupture his testicles, just squeeze them a bit so they both get off to it. After a couple steamy sessions, she goes a little too far and ruptures the poor boy's testicles into mush in her squeeze. She rides out her finger on her clit to the best orgasm of her life while the boy spews out the last cum he will ever produce onto her.