The sister who ends up making her brother's virgin penis initiation a document work. The sister comes to her brother's house to see how he's doing living alone for the first time, giving him advice on his daily life and future plans. However, the serious brother has no womanly side... The topic shifts to love talk. The sister is shocked to find out that her brother is a virgin, but she ends up running away from her brother to a forbidden act between siblings because of a small trigger. They can't hold back anymore and eventually fall into it...
