I'll bet you just got immense psychological satisfaction when the moment he started fucking your mouth at the end, n shot off in a heartbeat ....that must've felt heavenly!!!!
I used to suck this older married guy off i worked with who had a beautiful cock that looked just like this , fuck I miss him man. We smoked together the one day after work and said he noticed my bulge thru my shorts and asked if he could see it , fuck that got me hard when he asked it, I pulled it out and he said "wow dude your cock is huge! Can I play with it?" And I said " fuck yeah bro as long as I get to suck yours" we played like twice a month for few months than he moved away used to love sucking his cock