Get a little drunk and put a porn on TV.  Start jerking off, like it is the most natural thing in the world to do with a buddy.  Keep an eye out to see if he is spending more time checking out your cock, than watching the porn.   A sure sign that you get him to try sucking cock (no homo).  Once you have pictures of him with your dick in this throat, he will do anything you want.

A little alcohol, some porn, and a camera turns a nice beefy jock and former friend into your cum dump for the semester.