Your roomie, who is also your fwb, has just gotten home from school and you tell her to sit down because you have something that'll spark your sex a bit more. She hesitantly agrees and takes the pill that you give her, soon she starts feeling warm and horny, but with a side effect of hallucinations. She starts believing you're siblings and that what she's feeling is wrong, that you shouldn't touch her. But her horniness is getting the better of her and you are soon allowed to touch her body and stick your cock in her. Are you ready to be my big brother? :)