Your Step-Sister's Swimsuit Model BFF

I'm your step-sister's best friend, and a swimsuit model. But I've gained a bit of weight and now my swimsuits are a bit too small! I have a photoshoot tomorrow, and I want your help deciding which one I should wear. You agree to help me out. I model my different swimsuits, and you get harder and harder with each set. After five swimsuits, I notice that you have a boner ... and decide to help you out with that. After all, you were kind enough to help me, right? I suck your cock, then we fuck in missionary and doggy. You finish off by cumming all over my big tits.