Don't see this much in professional porn, because the guys tend to be too good at staying within their limits. But I've seen a few cool vids where the guy is banging away and pulls out and you see some precum drip out, or maybe a weak first spurt before he regains control, and then he puts it back in.
Two examples I can think of are Mr. Marcus fucking this girl in the ass -- then his cock slips out and a single shot of cum shoots out, then a bit more dribbles down the shaft, then he puts it back in. Another good example is Erik Everhard with Angel Dark where he's having trouble fucking her pussy, he pulls out, she strokes his cock, and precum drips on her hand (she looks surprised), then he fucks her some more, has to pull out again, and finally flat-out cums prematurely just from her sucking/stroking him -- then he fucks her ass without a break!
Two examples I can think of are Mr. Marcus fucking this girl in the ass -- then his cock slips out and a single shot of cum shoots out, then a bit more dribbles down the shaft, then he puts it back in. Another good example is Erik Everhard with Angel Dark where he's having trouble fucking her pussy, he pulls out, she strokes his cock, and precum drips on her hand (she looks surprised), then he fucks her some more, has to pull out again, and finally flat-out cums prematurely just from her sucking/stroking him -- then he fucks her ass without a break!