Mother keeps the promise to fuck her son if she graduates at the university

When she made the promise to fuck her son, this mature woman was possibly wearing a fart of the ostia and had not considered it well. That or his son had always been a fool of the care ass unable to pass nor gymnastics. But in the end the kid surprises her and graduates, so the very slut has to fulfill her promise and the son wants her to do it the same day of graduation. Under the robe he wears nothing: only his cock. The mother puts it in her mouth and they avoid the father as they can so that the slut fucks him as soon as possible in the room, something that the son does feeling that he has triumphed in style.