Yui was not satisfied with her sex life. Today, her husband rejected her, saying he was tired. Meanwhile, her husband's brother is coming to stay for a few days. To be honest, I don't really like my brother-in-law, so I would appreciate it if he would refrain from coming, but I want to be seen as a capable wife, so I decided to accept him. On the day, my brother-in-law is a manly, rough guy, but I was captivated by Yui appearance after he got out of the bath. Yes, his crotch is abnormally big. I hadn't thought anything of it before, but when I noticed the strangeness in my crotch, I couldn't help but be interested in my brother-in-law. Combined with my recent sexual frustration, my lewd fantasies grew. When Yui encountered a situation where her husband was out and her brother-in-law was sleeping, she wanted to actually see his crotch, so she secretly moved his pants. As she poked and prodded, her brother-in-law's thing got bigger. Yui held her crotch and stared at it from close range. When she came to her senses, she was drooling and sucking her brother-in-law's thing in her mouth...