My cousin's older sister came to visit us for the first time in a while. When everyone else left, she invited me to take a bath together. I remembered playing doctor and nurse and it made me horny. She's grown into a woman, and her breasts and ass have gotten bigger, and my erection won't go away. Covered in soap, my dick is pressed against her sexy body. As we washed each other, we started touching each other and my sister taught me about sex for the first time.