Oh, it's even fun to watch, I love porn with meaning. Wow, the housekeeper works her tongue so hard and the dude stands behind her and chases the bald guy, but holds the food tray at the same time. Now that's a fantasy at work. Lucky husband getting laid in front of his wife. Good for the wife for helping her husband relax, I wish I had such an advanced wife. I think the housekeeper was satisfied.
Now that's what I call a real brother-sister relationship - they're a team! And they were foolishly burned, because the sister at the end asked aloud if he came inside her. And so - all the movements are honed and memorized - it is obvious that they do it not the first time.