After my cousins visited after ten years apart, I couldn't resist peeking at their naked bodies while they changed clothes. When one of them invited me to join her in the hot spring, saying she wanted someone to play with, I eagerly agreed. As we soaped each other up, I noticed that his penis was hard. They kept teasing me throughout our time together. Eventually, we were left alone and decided to enjoy the hot springs just the two of us. We took turns exploring each other's grown-up bodies, and before long, neither of us could hold back any longer; we ended up having passionate sex right there in the hot spring...