Just go change

You go to the boys' changing room right away. You figure you would have your fun in the actual gym class itself.

The gym uniform for the boys are a pair of white t-shirt and black knee shorts. The uniform for the girls are the same only the shorts are replaced by tight black bloomers instead.

You see Anya wearing her gym uniform. Once again, her small chest shyly pokes out from her white t-shirt. You just want to lift that t-shirt in order to ascertain whether she's really not wearing a bra underneath.