Your step-sister is having a pool party with her friends and she asked you WEEKS ago to make sure you weren't home for it. But she'e going to need to do a little more than ask if she wants you gone. You tell her to show you her tits, which she reluctantly does. Followed by getting her to jerk you and suck you, all with typical step-sister attitude. She tells you to cum on her tits, but you have other plans. You tell her you will be cumming in her mouth. With her mouth full of your cum, she starts looking for somewhere to spit. But you tell her to swallow! She looks horrified but concedes. She swallows it down hard. You always win and she knows it.