She gets excited watching her sister exercise and fucks her

The boy has just woken up and watches his sister exercise on the floor of the house, fuck the aunt is on all fours and with her ass well pomp, it is normal for the kid to get excited, right ?! Well, it is what happens to him, that when he sees her in that posturita with his ass so exposed he gets the hard cock, and neither short nor lazy enters the bedroom, he approaches from behind and touches her ass, WTF! Little pants and we see the girl's pussy, does not wear panties, and panting pleasure, does it seem that incest is normal for these guys? ... 😮