All Her Firsts

Kuroko Tetsuya is gender fluid but she was born a girl. Everyone assumes she's a boy because of how she dresses during basketball season and she never cared enough to correct them. One day, after the Winter Cup, Tetsuya is approached while getting a drink from a vending machine. When she turns around, she sees a kind face smiling at her.
"Hey, you're Kuroko Tetsuya right? I was watching your game and you did amazing out there!"......

Or

How Tetsuya fell in love and it all fell apart