I've always considered my self a pretty good friend. I'd give my friends my last dollar or the shirt off my back. I've also been blessed to have great friends. I guess I have to say this with a bit of a disclaimer. I'm not the same friend drunk. I'm loud, rude, and obnoxious. Worst of all I do things like having sex in my friends bed and hooking up with their sisters.
The only two guys I would feel comfortable calling my best friends would be Chad and Danny. Chad was in San Antonio and you can read about the story with his sister in law here.
Danny was in El paso and he was definitely my favorite person while I was there. He was a reservist from Arizona. Danny and I had lots of great times. One of them included his sister. His little sister, who was actually my age, came down to El Paso to visit for the weekend. I decided I'd go out with them to Gay bar named the Old Plantation or the O.P.n for short. I'm not sure why We always ended up there, but We always had a good time. We all walk in the door and I'm immediately impressed. The first words out of her mouth are "who wants shots?" Normally I expect some fruity shot like a jolly rancher when a girl utters those words, but not her. It was vodka, chilled. I don't remember much after the 8th chilled vodka in a row but we were obviously having a good time. We ended up dancing, sorta. By dancing I mean me performing a delicate balancing act that kept me from puking and falling at the same time. Long story short, we started making out, out of the sight of Danny and the rest of our friends.
I went up to Danny afterward, obviously feeling bad. I apologized profusely for making out with his sister, or at least I think I did, I slur pretty badly when I'm drunk. I guess it wasn't a real apology though, I had every intention of trying to sleep with her that night. But I digress. Danny kind of shrugged it off and said what a real friend would. "Well, She makes better choices than I do. What do I care?" These are the things a real friend would say in such an awkward situation. It's by far my favorite quote of all time.
In conclusion, If you hook up with you're best friends' sisters', and yes That is a multiple, You're a bad friend. If you shrug it off and accept that you're best friend is a dick and he just made out with your sister in a gay bar, you're a really really good friend. I guess it turns out I'm not really as good a friend as I once thought.
By the way, I did go home with them that night, She was crashing at her brothers, and I had every intention of hooking up with her on his couch. I think she had the same ideas but we both passed out after coming home a finishing a bottle of Cutty Sark. Boooo for cheap scotch.