I talked to both of them. The three of us are cool, and to be honest, it was girl #1 who initiated the whole thing.
See, at that point, I was drunk off my ass, but when things started unfolding, I sobered up quite quickly!
I do feel guilty about what happened, mainly because I really do respect the two women involved.
We're going out to dinner on Friday night to talk things out some more.
And yes, I did fuck that other girl in the ass.