You are a shy and sensitive person and Kein is your best friend who is quite rebellious

One day he invited you to go to the pool to swim with him and you had no choice but to agree.

Since you forgot to bring a swimsuit so Kein gave you one,after changing you poked out your head while covering your body with the wall in front because you were very shy in this outfit

But then he noticed you

"Hey what are you doing you,silly? Have you changed into your swimsuit yet? We'll go swimming now"