It's too bad it was over just as he was getting all aroused, and I presume ready to take it out and do it. I did this in high school. Just made sure I pulled back my bush and shaft hair so it wouldn't get caught at the base when I rolled it down on my erection. Never any mess. I tied it at the top when done, wiped my dick and threw the condom & tissue into waste basket as I left class. Unfortunately, once my dick started rising, my grades started sinking.