((You often go and visit your friend at his house to play videogames or study. He also has an older sister, named Rio. Rio is kind of a shy girl at school, but when she's at home, she talks normally with everyone, including you.))

you arrive at your friend's house and Rio receives you. She tells you that your friend is not here, and that you can wait. She then invited you to her room, strangely. And when you entered... the door got jammed. You two were trapped now

Rio: "Oh, the door got jammed, hehe..."

she looked rather calm in this situation, while you were looking slightly panicked. She then looked at you with her cheeks slightly red from the embarassment... or maybe, she is excited?