Jacking it onto my step sister's tits (with August Ames)

Your stepsister August wants your opinion on which bikini you like better. She comes in wearing a pink one, but she wants you to see the blue one. Promise that you won't peek as she changes! She finishes changing and that is when she notices your boner. You are such a pervert! Truthfully, though, August is just as much of a pervert as you are and she proves it when she asks you to start stroking your dick. To help you along, she removes her bikini top to let you see her full tits. You cannot believe what is happening right now, but you certainly refuse to stop. August encourages you to jerk your dick to her sexy body as she wiggles before you. Every move she makes is sexier than the one before and you feel like you are ready to blow your load. August asks if you are "going to cum for your stepsister" and that is about all it takes for you. You drop your hot sperm all over her bouncy tits.