The lecherous cousin sneaked into her brother's room in the middle of the night

The main character returns to his hometown to visit his parents and meets his cousin Umi again. He quickly realized that his cousin was now an extremely hot teenager (18+), and he even had the opportunity to peek at her naked body while taking a shower. This turns him on so much that he starts lying in bed thinking about her. Umi finds out about it and after realizing that her cousin is still a virgin, she takes complete control of the situation and playfully orders him to continue masturbating. The cherry blossom explosion occurred the next morning. And a perfect cousin relationship followed. Yatsugake Umi has an incredibly perfect body. She's too good.