Sorry I don't have the links, but I remember seeing a vid of Lex Steele fucking Bree Olsen's pussy..Lex gets overly excited and can't hold back at one point, so he pulls out and strokes a small load on her pussy, saying "That's just the first one," then keeps going and shoots off on her face later.
And there was another one I saw: it was Eva Angelina's first DP scene, and one of the guys fucking her from behind gets too excited and cums on her ass/pussy, while the other one comments, "He's a horny motherfucker!" Later on they both stroke off on Eva as she kneels in front of them.
In both of those scenes, though, I'm not sure how much editing was done, so it might have been some time before the actors were ready to fuck again, unless they were taking something to stay hard..but anyway, it was in the same scene.