well, thanks for the replies guys.
here's a bit more info. i typed this all out originally, but it got really long. i'll try to keep it short
I was playing beer pong with friends A, B, and C. my partner sucked, and i'm the least tolerant to alch of the 4. I was shitfaced. A, B, and C were somewhat drunk themselves.
so A gets a text from D's sister. D is not with us. We get invited to sneak into friend A's house..... (yeah.....wierd. ) Friend A's sister who just turned 16 and was having a party there. they too were drunk.
i hooked up with A's sister. A hooked up with D's sister.
I'm 17, and i graduate in 60 days (December 21st

what can i say, i'm a baller fo sho

), and then my parents are moving to Mexico on December 27th. so i'll be pretty detached from my hometown, and that makes a LTR pretty much out of the question. in other circumstanses, i'd seriously consider it. she's really cool.
and i don't mean fuck by hook up. just messed around. don't really remember all of it..... i got most of my info from her, her friends and B, and C the next morning....
But right now, i think we're cool. He knows its gonna happen, and its not like i wasn't drunk and took advantage of her. and he pretty much did the same thing. I was really worried for a bit there though. The kid really is my best friend.
now i just need to make her understand it was probally a one time deal. any advice?