That was beautiful! Such a fine young cock and handsome balls. But that talented mouth made me twitch in my chair watching your skillful work. What a nice creamy reward you lucky slut. Yummy.
It's new to him and he doesn't know how it goes. Lots of vids show jack off into the mouth scenes. The guy sucking should have told him to put his hand away and relax. Say something like "Now put that hand away and relax. I'm gonna take your cum with just my mouth you're gonna love it."
Wasting the precum drop at the beginning was sinful, that was a result of him driving there, thinking that another man was going to suck his penis and swallow his cum. The frat guy exhibited an alarming trend I've seen with younger men in that he had to masturbate to climax. It's all this damn porn that people watch, it desensitizes you and you need harder stimulation to get off. Thankfully for my generation, this wasn't a problem and I'm so grateful I can to this day climax from oral alone, hands-free.