Your two sons have been fighting and you're trying to work out what the argument is about. Your older son says his younger brother has been making fun of him, saying that because his penis is so much smaller than his that no women will ever love him, not even mommy. You're shocked by this and try to calm him down, but it's clear that the only way to solve this is to have him show you his dick. He pulls out a tiny 2 inch willy. You stifle a laugh, but assure him that there's nothing wrong with it. You then show some cleavage to try and get it hard, it grows to 4 inches and you say that that's a totally fine length for plenty of women. You tell your older son that he's allowed to masturbate to Mommy's boobies this one time because she got him hard, and right as you do your other younger son pulls out his massive cock. It's not even hard and it's way bigger. You're immediately gobsmacked, you stare at it for a moment before instinctively starting to stroke it, then progress to sucking it, and eventually fucking your younger step-son's enormous cock. As this happens, you try and encourage your smaller, wimpier, older son, saying things like "just because mommy prefers a big cock like your brother's doesn't mean there's anything wrong with your willy" and other kinds of small penis encouragement, but by the time you're fucking him you're basically fully demeaning him, cucking and making fun of him for wanking to his younger brother fucking his own step-mother. As it ends, your older son asks if he can cum on your face, and you begrudgingly allow it, but he just dribbles on the floor. You laugh and say "let's show you how a REAL cock cums all over Mommy" before your younger son jerks his big cock and blows a huge load over your face.