Not only a mature man can get an erection from such a sight, but even an old man can get an erection from such a sight. He was very lucky that he caught the masturbating babysitter, because the girl is very appetizing and her pussy and ass just alluring with its narrow hole, into which I would also dive with pleasure.
Japanese girls are all natural - breasts and pussy. They don't pump silicone, they don't shave. And men love it. And I'd stick my hand in her pussy instead of my finger, so she'd shave her pussy next time. Of course, these domestic females pretend that they are so shy and defenseless, but the juice dripping out shows that she likes it very much. And the hubby jerks her clit as he pleases - she's just a toy for his penis!