NPH-051 - My cousin sister, whose breasts have grown, invited me to take a bath. Mina Mitsuki

Early in the morning, while trying to take a bath while everyone was asleep, my cousin sister who had been staying over since yesterday said "Let's take a bath together!" and started taking off her clothes. I involuntarily became aroused by the fullness of her grown breasts and plump buttocks. As she pressed her buttocks against my penis, she asked, "Are you thinking something lewd?" While washing each other, she gripped my erect penis, and our excitement became uncontrollable, and washing turned into touching. Her grown body, and my fingers weren't enough for her wet vulva, so I inserted my penis. We had secret sex in the bathroom.