<< If he's really your best friend, you should be able to be up front and discuss it with him. That is really what friendship is all about. If his continuing friendship means anything to you, why would you consider doing anything else? >>
i'd ask him first of course, if it were to happen. i don't think i made myself too clear to begin with, he isn't my -best- friend, he is my best guy friend but just someone i hang out with. i'm thinking i'll stay away from it though, tempting as it may be, simply because of the sister factor in there too. it would be awkward