Teen boy meets and greets stepdad while his girlfriend is being used

My boyfriend\'s secret fantasy is to watch his stepdad fuck me. He\'s always lurking, watching us get it on. It\'s taboo, but it turns him on. When he walks in on us, he joins in, fucking me while his stepson watches. It\'s a sight to behold, a phat ass stepdad and a horny boyfriend sharing a curvy, thick teen.