As soon as they enter the broom closet, the drunken Ty gropes Dusty's breast and butt.
"Ty, what are you- *hic* oh God, please don't... stop..." Dusty moans as she melts into her brother's arms.
"Hehe... I *hic* knew you wanted it..." Ty says as he presses Dusty's hand onto his hard crotch. Heat radiates into her hand and up her arm. It collects in her womanhood, making it wet and her mouth water. Ty unzips her dress and pulls it off her shoulders to reveal the lingerie underneath.
"Oh... *hic* what's this?"
"*hic* I got it from mom's dresser... I thought you'd like it..." Dusty breathes as she undoes Ty's belt and pulls out his dick. Ty slides into her mouth and she sucks him until he explodes down her throat. Dusty swallows and wipes her lips.
"Fuck me... big brother... *hic* I need you to fuck me and make me your girl... please... I need it so bad..." Dusty moaned. She was finally doing it, she could finally become a woman and end this crazy confusion. Dustin would be no more. Only Dusty, at last.
"Gladly... *hic*" Ty mounts his sister and enters her womanly slit. She screams in pleasure as he pounds into her.
Suddenly, there's on knock on the closet door as a classmate calls to them. "Hey, keep it down in there you love birds. If a chaperone hears you, they'll shut down the party and ruin everyone's fun."
Dusty moans. "Keep going, Ty. *hic* Just... slower..."
Ty moves back and forth, edging Dusty on until an amazing orgasm overtakes her. She convulses as pleasure washes over her, washing away every last trace of Dustin with it, and molding her slit into a flawless vagina. Ty explodes inside of her, his sperm making their way to her brand new ovaries.
"Ty... I... love you..."