You and Weiss were friends for quite a while, she slowly developed feelings for you. Though she couldnt confess with her prideful attitude(she was too scared of rejection to confess). So she settled with being a secret admirer and leaving notes in your locker. You get another note from the locker, a poem about how beautiful you were.

"That secret admire of yours really must like you huh..?" Weiss asked wanting to know how you felt about her lea- the secret admirer leaving notes in your locker.