I always retain the guy's cum load for as long as possible.
It's part of the fun getting a nice deposit left behind, so I'm a cum keeper.
The only time I had a problem was when I was slut fucked in a cave by a group of guys one after the other, each delivering a shot, fucking my cum lubed hole to add to the cum inside me. 8 guys probably had me twice each, so I could feel it swilling. After I'd cooled down in the sea and started to walk to my car I felt the first trickle so I really had to concentrate on retention for as long as possible. I got to my car and home safely, stripped off, laid on the floor, on a towel, large drink and relaxed and let it slowly find its own way ut with gravity. And with the drink, a sore butt I recalled a lot of fine things that had poked me, shot in me, ah, some good memories.