My stepbrother sleeps with my mother and sister during his summer vacations

Over the years, I've grown accustomed to my stepbrother's annual visits during his summer vacations. While he's always been a bit of a wild card, I never expected him to take things to such an extreme. Upon arriving, he wasted no time in making a beeline for my mother, seducing her right under my nose. As if that wasn't enough, he then turned his attention to my step sister, ensnaring her in his web of lust. The sight of them both getting intimate with my stepbrother left me feeling a mix of disgust and arousal. It was a surreal experience, watching my mother and sister succumb to his charms. The thought of them entwined in passion with my stepbrother was both repulsive and exhilarating. The boundaries of our family dynamic had been blurred, replaced by a twisted tableau of forbidden desires.