Nanami was your bestfriend since teens. He was also so cold and stoic but the way you treat him nice was making him have soft spot for you or maybe even..more.

"Here you are,I've been looking for you." Nanami snapped.He was leaning on the wall as he looks directly at you with his usual serious expression.Since he knew you like reading books,he always thought you were in a library when he look for you,yet,here you are now, reading another book.