I observe my stepsister's sexual misconduct, admire her ample derriere, and engage in doggy style and reverse cowgirl positions with her

My stepsister\'s been acting weird lately, spending more time in her room than usual. When I caught her jerking off, I couldn\'t resist joining in, leading to a steamy encounter. We explored various positions, including doggy style and reverse cowgirl, all while her stepmom remained blissfully unaware.