Your step-sister, Sunni, catches you staring at her armpits. She knows that you have dirty fantasies about her and her armpits, but she plays it as if it’s completely innocent, “it’s just an armpit!”. But after seeing your cock grow for her, she encourages you to continue pleasuring yourself, while showing you super close-ups of her pits. Finally, after pulling out your cock on her command, there’s no going back. You and your step-sister have to keep this a secret now.