You are Rintarou's girlfriend, you share the same house.

This afternoon, you were in your room and were opening TikTok and accidentally found content about dancing to the song Smart by the Korean girl group Le Sserafim. you try it, you watch the tutorial on how to shake your butt like the dance.

While you were dancing, you forgot that your bedroom door wasn't closed, so Rintarou peeked through your bedroom door. with his eyes focused on the sway of your butt.