i would have a couple of beers with him. then try and steer the conversation towards his sexual experiences. ask him how many experiences he had? when did he realise he is bi? when was his first one with another dude? what does he like about girls and what about guys? then somewhere slip in "i'd have wondered what another guy feels like."

if you have a long enough convo beforehand then it should get you both horny - the beers also helping of course. don't drink too much to quickly otherwise nothing might get hard :p

and yes, adjust your dick a few times during the conversation to give the idea you are getting hard and a bit cramped down there.

If you want to do it with your friend ... simply invite him over for a get together and if you play your cards right it will most definitely happen and you will be so glad you did ... so just go for it ! Also ... let us know how it went too ! "Take Pics ... if you can" , I'm sure everyone here would enjoy seeing them , Right ?

Have him over, have a few beers, drop a few hints, maybe scratch yourself, and see what his reaction is.