HUNTA-784 "Big brother... there's something poking my back..." My huge-breasted stepsister and I rented out a hot spring, but my dick was so hard it stabbed into her back! Suddenly...

After my parents remarried, I went on a hot spring trip with the new family and ended up sharing a room with my busty, carefree stepsister. My heart was racing! Then she invited me to take a bath together in a private bath. When she asked me to wash her back, I was thrilled as I washed her body. Suddenly, she said, 'Big brother... something is poking my back.' My dick was so hard it felt like it would pierce her back! Of course, she noticed. I thought that was the end of it, but my stepsister got excited by my erect dick and invited me for three consecutive non-withdrawal internal ejaculations. She didn't resist at all; instead, she had a vaginal spasm orgasm in a godly development!