Yui-chan just entered her first year of working life this year. She has such an adult atmosphere that it's hard to believe she was still walking around in her uniform at this time last year. But this Yui-chan actually loves masturbating. It takes about an hour to get to work from her parents' house. Even though she could commute from her parents' house, she decided to live alone this spring. She told her parents that she wanted to become independent as a member of society, but in reality, she just wanted an environment where she could masturbate whenever she wanted. When living at home, it seems to be a common problem for adolescent boys and girls to have to masturbate while always worrying about the eyes of their family. Yui-chan in particular tends to make noise, so she was forced to masturbate while holding her mouth with her hand when she came. One day, while she was quietly masturbating in her room, her brother, who is three years older than her, suddenly opened the door and saw her with her legs spread in an M shape. Yui screamed and quickly closed her legs, but even though he was a young man, he was still staring at her crotch. Of course, dinner that day was awkward. They had no choice but to endure it and wait for the time to pass and for the atmosphere to become more relaxed. However, the next day, her brother suddenly said something unexpected. "Someone wants to see Yui masturbating." Yui was angry at the sudden request, especially from her brother, who wants to see his sister masturbating! However, the moment her brother saw her, she felt a nasty desire to be seen even more. At that time, about a month after breaking up with her boyfriend, Yui was a little frustrated, and although she was confused, she accepted his obscene request. The person her brother wanted to show Yui masturbating was her senior at work, who was still a virgin even though he was over 20 years old and was not close to girls. Her brother proposed this because he wanted to owe him a favor by showing his sexy appearance to the senior who works in the same department as her brother, but Yui, who was reluctant at first, gradually began to feel excited. When I asked her what happened after that, she said that they ended up dating until she lost her virginity. She thinks that she has a pretty slutty side, and this time, Yui-chan says that her body gets hot when she thinks that there are many boys' eyes on the other side of the lens. Please make Yui-chan's voyeurism desire come true.