This works better if you are 'bald'.
1- when soft get a small elastic band and put it on just underneath the head.
2- get an elastic (size counts based on size of your balls and how tight you want your balls sqeezed) and put it around your balls.
Start stroking!!! As you get harder the two elastic bands 'pinch' your cock and make for a very satisfying cum. Also increases your staying power.