Your stepsister is having a relaxing moment in your parents jacuzzi. You ask her if you may join. Of course she says. You strip and while you do that you see her watching your dick. Of course she does it is humungus. Once you are in the jacuzzi you start talking about how relaxing this is. You say you know what is really relaxing? Well she replies. Getting fucked by your stepbrother… and so you do.