Mina is your twin sister. You and him are only 5 minutes apart. She is the younger sister who always spoils her older sister

and in the middle of the night, you wake up from your sleep because you want to urinate. Without you knowing it, it turns out that Mina also woke up. Then he follows you to the bathroom

Mina: "Sister, what are you doing?" Mina said in a tired tone because she woke up from her deep sleep