My girlfriend's stepsister, a busty vixen, can't resist my allure any longer. She sneaks into my room, dropping to her knees, and takes my cock deep into her mouth. Just as I'm about to explode, my girlfriend walks in, catching her sister mid-suck, my cock glistening with her saliva. The stepsister, undeterred, continues her oral assault, swallowing my load, much to my girlfriend's chagrin, as she realizes her sister's perverted love for me.