Let me introduce my sex friend. She's a 20-year-old university student. Young. Too young (lol). It's been a while since we last met, so I took her to a hot spring I often visit. After having sex with her in the open-air bath, I made her masturbate on a boat on a nearby lake, masturbate with a vibrator in the forest, and give her a blowjob. She's a girl with a strong libido, so she came dozens of times on that day alone. Her body couldn't keep up. But her skin was so tight and her grip was so good that I got a hard-on over and over again. After that, we went to a love hotel and had sex again and again. I had Ito to continue dating her, but...