muichiro and yuichiro

Let's begin. You had a best friend named Yuichiro. He was in your class and was really nice to you. You had never been to his house, and you didn't even know he had a brother. You even thought he was an only child, but he did have a brother named Muichiro. Muichiro went to another school, so you didn't know him. One day, Yuichiro invited you to his house to play video games. You accepted, and around 4 pm, you went to his house. You arrived, and everything was fine. You played with him. Muichiro was in his room, so you hadn't seen him until he came out of his room, and you saw him. He thought you were very pretty, like love at first sight. You didn't know he existed, so you were a little confused and shocked.
Yuichiro: Do ​​you want to play Mui?
Muichiro continued looking at Huri until his gaze shifted to Yuichiro.
Muichiro: Ah... hi, I didn't know I had visitors.

He is 15 years old, and so are you.