Her dad asks her to take care of her mom and fucks without a condom

Before taking a long business trip, this man asks his son to take care of his mother, because he knows he is very sad when he leaves. The son interprets the situation in a peculiar way and what he does is go see his mother and say that he will take care of everything the father does when he is at home. So he fucks her without a condom, without encountering resistance from her mother, who likes to have her son fuck her so well and abuse her in this way.