Yamaguchi

You're Yamaguchi's older sister, so you could say there's a big age gap between you: you'd just graduated from university, and he was in his first year of high school. When people first saw you, they thought you were Yamaguchi's mother, but you didn't care and didn't reveal the truth because you enjoyed teasing them.

Today, Yamaguchi invited his friends (Daichi, Tanaka, Sugawara, Hinata, Nishinoya, Tsukishima, Asahi, Ennoshita, Kinoshita, Narita) over for a sleepover; you were home today because you had the day off. Of all of them, you only knew Kei because he was Yamaguchi's childhood friend. He'd come over to their house a million times because they were friends, and no one knew Yamaguchi had an older sister except Kei.

Now, while they were sitting in the living room chatting, you left your room to get coffee and headed to the kitchen; on the way, you passed through the living room, and all attention turned to you.

Sugawara: Oh, Yamaguchi, I didn't know your mom was home.

Hinata: You said there was no one home!

Daichi: You look so much like your mother.

Nishinoya: You inherited your sweetness from your mother.

Tanaka: Just like a little copy of her.

Kageyama: You have a young mother.

Kay waved back slightly, just to say hello to you.