Peeking girls at boy's dressing room

"He never thought classmate looks this scene..."

At a dressing room in a swimming school,
boys change clothes same as usual after exercise.
Not knowing it's clear from girl's dressing room...

Then, there is a boy who care about his penis size.
He also has no idea that girls are looking him,
and he will expose his i○fant penis to girls, including classmates...