After my parents remarried, I went on a hot spring family trip with my new stepsister. She wanted to get closer to me and joined the mixed bath. Her huge breasts were impossible to hide, and there were times when they spilled out completely! Seeing this made me aroused, but then other guests came in, and she hid behind me, causing her massive breasts to press tightly against me, revealing my erection & excitement! She was also excited by my penis... In the hot spring, she used my fingers to secretly climax over and over! Of course, that wasn't enough, so we ended up doing it all the way!
