It totally surprised both of us. I was giving my friend another foot job, the fifth of the morning. I would give him one till I could lick up a bit of precum (I love the way he tastes) then he'd give my feet a tongue bath. Mutual satisfaction was the plan. We'd been at it for a couple hours and were thinking of where to eat breaky, all I did was to stimulate his tip a little and he started to orgasm, so I kept stimulating the tip, and watched the clock to seehow long we could keep this going.
I figure that he could try tantric sex someday with little to no problem (he lasted through most of "The Dark Knight" with no problems)