Violent Red
If you're looking for a love story, this isn't it.
Nobara has spent the past thirteen years struggling not to kill her best friend's horrible twin brother. She hates Sukuna, pretty sure she'd stab him if Yuuji let her, and has been dodging his very obvious advances since he realized she was a girl. And yet here she is, alone at a party, feeling moody after a bad break-up, letting Sukuna touch her like she's never allowed him before. It's a terrible idea, one of her worst by far, and she still hates him, but damnit if he doesn't have something terribly delicious to offer.