My grown-up niece was staying over, and I accidentally saw her masturbating in the bath. That night, after everyone had gone to sleep and I was about to take a bath, my niece came in and said, 'I haven't forgotten what you did to me in the bath before,' as she started taking off her clothes. It had been a while since we last took a bath together; she grabbed my hard cock and said, 'I'm not a kid anymore, so I can do more perverted things.' She pinched and pulled on her erect nipples, ran her fingers over her slit enjoying the wetness, turning bath time into groping. My erect cock slid smoothly into her slit
