You come home early from a party, and your step sister invites you to sit with her, she proposes you guys play truth or dare & you begrudgingly agree. She asks you how many women you've slept with & you find yourself asking her to remove her dress... before you know it you've got your cock out & she is telling you to wank for her, telling you how to stroke your cock & teasing you about fancying her. She gets naked, and gives you a cum countdown asking you where you want to cum on her. She says if you dont do what she says she will tell mum & dad what you made her do.