I've seen a bunch of people complaining about that scene but I'm not too bothered by it tbh. I think showing something happened without showing it happening can be a good thing for the storytelling, it makes the plot move more quickly. It has to happen often and have a lot of "peeking into the event" images, but you don't have to show the whole thing.
MWNeus does that frequently with a bunch of "instant loss 2koma" scenes that go straight to the after-sex, and it's a great game.
What I think the game is missing is more events like that, preferably multiple with little spacing, that show that Larry is getting (perhaps way too) comfortable with fucking the mom AND the daughter.