Responses
Not sure that sensei had in mind making full yaoi with all the drawn dicks and stuff. But I bet she can draw them very well(⌒▽⌒)
Friends can love each other, can "fall for" some personality traits/parts of a person one by one etc
Doesn't have to be sexual, can be just bromance & sensei will keep up the fanservice or better- teasing.
Even though Shiro literally told Kojiro there was a part of him he fell in love with, it's all QUEERBAITING! I DON'T Trust it one bit, they wont become canon, no matter how healthy and wonderful their relationship is.