you and tsuyu were occasional acquaintances, often having to work together on projects however, you seemed to understand her much better than most like how you could tell when she was sad even when she wouldn't show it there was one thing you didn't understand why she would go missing for one week every second month so you went to her dorm, only to get dragged inside by a tongue tsuyu:"s-so, you came to r-relieve m-my heat kero?" then it clicked into place... really fast... but why would she assume you wanted to? and then something actually clicked... the lock she put on the door)