its not that hard as long as you aren't an ugly bastard. got any pics?
really all you ahve to do is ask, but if you don't want it to be that straight forward, invite him over to bro out, just play some vidya, than watch a scary movie or something, faggots love that shit. make jokes that if he gets scared he can grab on to ya. then when the movie gets scary start making moves, just wrap your arm around him, etc. treat him like a girl basically, faggots love that, then when you get a little hard just whip it out and tell him to suck it.