It was a simple massage, but the man felt how little by little he was getting more and more horny. his cock was hard as he massaged his son. he told her to lie on her stomach so he could give her a better massage, but all he wanted was access to his ass, which he got. concealing, he lowered the boy's underwear, as if that were included in the massage, but it was only a test to see if he said something. when he verified that the boy did not protest, he went further and further. he took out his cock because it didn't fit in his pants anymore and started touching himself while he massaged his son's anus. then he undressed and penetrated him from behind. there was no massage anymore, just an incestuous anal fuck between a degenerate father and a rather vicious son unable to say no to him.