I was SOOO horny from about 14 to 16 that a few times I actually did it twice in a row. Not like hours later, but RIGHT AWAY!
Sometimes at school restrooms it was a guys hair or how smooth his arms were, did the trick for when I was wanking alone at home. But here seeing a dude feeling what I was. Then Oh-Uh-Mmm-Gah, I launched a long white cum stream into the urinal. I guess seeing that helped this dude, he cummed right after me. Our arms touched when he shook the last drops. That was not much contact, but the warmth and softness of his skin seemed electric. I felt a little inner glow out of that wickedly chanced bodily connection.
All the while telling myself, Dude you are CRAZY, you know that? You are completely DEE-mented!
(A scant comment into story by-)