She caught her brother gooning his fat alpha dong to gay porn she knew he'd be wasted sniffing other dude's asses, she just had to slowly wear down all the brainwashing society had done to make him think incest was bad, now he's a proper sister fucker
You'd kept INSISTING you'd managed to cure your crush of being a lesbian, that there was no way she was still interested in women, your sister had her doubts & before you knew it your crush was tongue kissing your sister's cunt like a good lesbian whore