Back story today my girlfriend came over and wee watched a bunch of Christmas movies and stuff well at one point my sister (20F) joins us on the couch not in the same exact couch but in the living room and my girlfriend is leaning on my chest and she looked at me and we kissed twice my sister stops us and says "really guys get a room there's no need for that" and all im thinking in my head is i cant count how many times she made out with guys on the couch. So i said did you froget who you were in high school and she then said "excuse you please tell me Cody what i was like in high school you were like 12 when i graduated" i said "yeah but i have heard the story's and oh boy there's a lot" then she said "fuck you i came home for thanksgiving so i can see your stupid ass that bitch over there took my sweat little brother" and then i fliped. We went on and on till our mom stoped us AITA?