This guy's jackhammer is kind of sluggish - I'd go in there with my periscope and jerk it a couple of times! With breasts like that, you can have multiple males at once - you just have to wiggle your finger. And the mother is really cool - look how the eyes shoot, she enjoys being filmed. That's the effect the scene has on women. Even in bed.
The brown-haired girl is not an ordinary modest girl. So she showed off her skills in front of her lover. Apparently she has a lot of experience.