My step-sister joins me in watching TV and gets surprised when I start masturbating, leading to her wanting to see my ejaculation

I was lounging on the couch, flipping through channels when my step-sister sauntered in. She plopped down next to me, her eyes glued to the screen. As the content on TV grew more explicit, I began to pleasure myself discreetly. To my surprise, my mature stepsis caught me in the act and expressed her curiosity about the experience. I offered her a glimpse of my arousal, and she couldn't resist the allure. With a mischievous smirk, she reached over and began to stroke me, her experienced hands working their magic. The sight of my impending climax ignited a desire in her, and she eagerly awaited the moment she could witness my release. The sight of her watching me in such a vulnerable state was both thrilling and arousing, making it impossible to hold back my orgasm.