How about Chuuya falling in love with a girl that works at the cafe he loves going to? She always write him cute stuff in his cup like "I have that book too. I would suggest you this one. Hope you enjoy your drink!" and at some point they just start chatting and it develops to something more?
Oh. my. god. I literally squealed! This scenario is soooo cute!! Wahhhh
I was craving for Starbucks while writing this lmao…