The fic was most definitely on AFF! 

Sehun and Kai were best friends who lived together. 

Kai loved sehun, and i think sehun knew that too. Sehun didnt believe in love and such!

At school sehun kept getting confession, and so asked kai to be his pretend boyfriend in order to ward off other people.

Sehun slowly starts liking Kai! Like he was to cuddle, take pictures together and stuff~

I also remember that another pairing was kriyeol? Chanyeol falls for kris , but kris doesnt feel the same at first! 

I remember one scene,  kai and his friends transferred (?) to sehuns schools for a dance thing. Everyone was gushing about how handsome kai was, and then kai sees sehun. Then he approaches him and stuff, and everyone is shocked that kai is sheuns boyfriend.

I really want to read this again! it was a great fic!