My fwb and I had an experience recently where I slapped his balls to keep him from cuming too early. It worked. And I can't get it out of my head now. I want more, and I want it harder.

I just imagine tying him down and jerking him or sucking him until he got tight and I knew he was close. And then I'd hit him, or squeeze him, or bite him. Then just repeat. The second time would be the most perfect, since he'd know what was coming. I'd edge him for an hour like this if I could. See him arch against the ropes. Maybe he'd beg me to let him cum, or even beg me to just stop cumming be damned. Maybe I'd tell him, "okay no slaps this time" and then pull them instead.

(p.s. does anyone know of good porn like this? where he's trying to cum but the pain prevents him? all the stuff i found like stops the pleasure when the pain starts)