Having said that your best bet is still at night especially after a few beers. As mentioned, talk about girls and sex and who you would like to fuck. Also ask how often he wanks, to get a feel for his sex drive. Then put your hand in your pants and have a little squeeze and see how he reacts. if it goes well then say how hard you are getting and how cramped it is in your pants. See how he reacts. If he gets weird and nervous then slow down or abandon... if he seems interested then pull it out and jerk off a bit. If he follows suit then you're made. Comment on his size and a good way to make it mutual is to say something like "wow yours is so thick" and ask to compare using your hand. Put your hand around your girth and then keep your hand in a fist to match the size and then slip him into your fist and give him a few strokes. If he is smaller then this may not work, unless he comments of how big you are.. you can respond by saying "no, I'm not much bigger than you" and then do the fist test as mentioned.
