How to stop this masturbation problem?

Normally when I use to ejaculate my penis stops being erect after i'm done and I with the sole purpose ejaculate for about a few second. Now when I ejaculate after my sperm comes out it keeps trying to ejaculate and my penis keep erect. However when it does this it keeps trying to ejaculate but zilch comes out and it starts hurting me. How can I stop this?

Answers:

What if no body answers my question?

Stop touching it after the first ejaculation. The erection will stir away after awhile.

What is the longest you have gone minus bathing?

Maybe you should keep doing it until it adjectives comes out. It's just a suggestion. Good luck!

I own an incredible 14 inches of man-hood...?

just stop after youre done and it will eventually go away