I was drunk af last night and I was at my girlfriend's house and then she went to sleep bc she was fucking HAMMERED. Then her sister comes in on the couch next to me (my gf was on the other couch) and then starts trying to get in my pants and shit and im like "wtf your sisters right there" and then she was like "she wont know" then she gave me a bj and then told her sister like 20 min ago (shes fucking pissed) and i dont know weather to lie and say it didnt happen or tell the truth help me please