I am 21, she is 18, I have hooked up with one of her good friends several times. She found out once, awhile ago, and was upset. It kind of fucked up their relationship for a while, but there cool now. However I just got a phone call from my sister and she said "Were you planning on telling me you hooked up with *friends name* agian." I told her no and she hung up. I like her friend, I think shes sexy, shes fun to hang out with, and out of the girls ive hooked up with 1 of 2 who i would date. How do I get my sister to chill the fuck out? I think our mom is on my side and could be used to my advantage.