Looking for scenes where the guy is clearly trying to "finish" without cheating, and be starting to cum just as he's pulling out from her pussy. But it's not easy and he has to drop any concerns about camera angles and focus on simply pounding her, and pounding her, and pounding her, to get himself over the edge. It drags on like a siege, with her aware of what he's trying to do and trying to be more vocal to get him over the edge. But the final payoff is a huge cumshot.