Masao had not been allowed to go on a trip by his mother for a long time. He went with his cousin, Eimi. Due to an emergency, Eimi arrived at the destination first, and Masao's mother could only come the next day. Therefore, he spent the whole day playing with his cousin, Eimi. Due to carelessness, Masao spilled a drink on his pants, so Eimi quickly took him to the room to take off his pants so he wouldn't catch a cold. When Masao took off his pants, Eimi was very surprised to see his very large and erect penis. Since it had been a long time since she had sex and seeing Masao like that was not appropriate, Eimi made a bold decision, to have sex with Masao!!! And so, throughout that day, they were always close to each other, having sex and letting Masao release all of that "bad thing" inside Eimi.