pretty complicated. I would say your friend is looking to you for sex, not necessarily for anything deeper. The fact that you two have messed around some, and that it took some time for it to proceed from jerking off behind to pillows to sword fights, to oral, would mean that he isnt all that comfortable with the idea of man/man sex, but he gives in with horniness and alcohol. My biggest concern is his wife. If she accepts him messing with you, then no problem. But if she is clueless, seems like to me you are really betraying your friendship with her, and possibly screwing up her future. I have no problem with people in open relationships, because thats what both agree to. Blowing your buddy behind her back tho is not ok. just my thoughts.