His father gives him permission to put his own mother's cock

That an uncle like this who has not fucked in his life gets his cock to his own mother is practically a miracle. The kid goes to college and one morning the father appears in the room and tells him that he has permission to fuck his mother, to which the mature responds by grabbing the son's cock and shaking it. Then the father leaves to leave them alone and the mother takes care of starting him in sex, enjoying his tail and telling him exactly how he has to fuck her to give him pleasure and let him have a good run.