I had one experience like that, where I sucked and sucked. The guy had a cock ring on, and he just did not cum. He seemed really excited and may have...
It could be mostly his fault and not your skill or effort, if he was not turned on by a guy sucking his cock he's unlikely to cum ............. also...
I've only been fucked a handful of times so far. I'm driven to bottom by that feeling of giving up my ass to another man for his pleasure. The sexual...