What does your conscience tell you? Would you want this to happen to you if the tables were turned? Regardless of your decision, don't be foolish and use protection!
u can bang whoever u want, all girls are horny and borned to be banged. also what i wanna say is, no matter how long we are going to dicuss here, u'll still going to bang her friend anyway. no one can change ur mind. so go ahead and have fun! :)
Uhh...
That is called "cheating" to the rest of the world; there's nothing illegal about it, but it's very immoral. I would say stop, and just end it there.