Secretly penetrating my promiscuous stepsister's backdoor while she slumbers, resulting in a mouthful of jizz

After a steamy night of partying, my mischievous stepsister fell asleep on the couch, leaving her voluptuous ass exposed and inviting. I couldn't resist the allure of her luscious curves and decided to take advantage of the situation. As a sneaky fox, I slipped a fingers right inside her backdoor, causing her to stir but not wake up. The thrill of the taboo act and the risk of getting caught only fueled my desire. A few minutes later, she woke up, unaware of what had happened until I revealed it. The realization of her ass being penetrated while she was asleep left her in shock, but also aroused. As I continued to pleasure her, she eagerly accepted my offer of a taste of my cum. The sight of her squirting and swallowing my load left me in sheer satisfaction. This was a secret slumber encounter that would certainly leave a mark.