One day, the younger brother who lives with his older brother brings his girlfriend home. The older brother is a little jealous of his cute girlfriend, who seems out of place with his younger brother. He can't help but open the door and peek in when he hears voices coming from the next room. What he sees there is his younger brother being dominated by his cute girlfriend, even his anus. He is shocked by the sight, but at the same time, he is excited. Since then, he can't help thinking about her. Then, when he comes home from work, his girlfriend comes out of his brother's room...