I can't come right out and say it. This needs to be handled delicately (we're friends and if this doesn't turn out the way I want it to, we're still going to have to act normal around our other friends). I'm not asking for ways to give him hints. I just want a nice way of talking to him about this.
If you need more information on the subject, go see my last question. It's titled "Advice for a high schooler who's lusting after a college senior - advice from guys and girls wanted!"