Drink Beers, put on porn, get hard, adjust frequently, walk to bathroom sticking out, come back with pants partially open, complain about discomfort, see if he responds about his own discomfort. If yes, pull it out. If he appears uncomfortable, let it go. Wait for him to respond. Keep drinking. Eventually he will need to get up and pee. If he is protruding, comment on how it looks like he is enjoying the movie too and laugh. At this point, make some comment about getting hey we are both guys and these levis are killing me. Go get some loose fitting shorts on that even more accentuate the bulge. Start rubbing yourself slowly but dont look at him. Glance and see what he is doing. IF this doens't work, it ain't going to happen.