Draining my step-sister's boyfriend's dick

Tracey is looking out for her younger, virgin step-sister when she talks to you. Her step-sister is your girlfriend, but Tracey does not want her step-sister losing her virginity to her sweet step-sister. Tracey wants to make sure that you dump your loads before you get to her step-sister. The plan is to help you to get off before her step-sister comes home, so get your dick out and start stroking it. You never would turn down such an offer, so you whip out your dick and begin. Tracey reveals her titties to you as inspiration, but she reminds you that this is a confidential transaction to be shared with no one. You agree to the terms. She asks you to think about squeezing her soft tits, though you already were thinking about doing just that.