First, I'd tease him by lightly licking his frenulum, starting at the top, then each side, ending with a direct hit in the middle. Next, I'd slowly put him in my mouth, swirling my tongue around that lovely cock, from top to bottom, over and over. Finally, I'd deep-throat him until he cums, keeping him in my mouth afterwards, caressing his softening dick with my tongue, for as long as he wants.