Baekhyun and Luhan have been friends since childhood, but Chanyeol is the one friend Baekhyun turns to when things go wrong. He loves the way Chanyeol comforts him, hugs him, and cares for him, but he knows Chanyeol can't love him back, because Chanyeol already has someone else. A certain someone who goes by the name of Kai, and whose heart secretly belongs to Kyungsoo. 

By blurring the line between friendship and love, Baekhyun gets too caught up in trying to repress his changing feelings toward Chanyeol, and he begins to lose Luhan's trust. Soon, Luhan finds himself struggling to keep their friendship from completely falling apart... while discovering his new-found love for Sehun.

LINK; http://www.asianfanfics.com/story/view/477536/crossing-the-line-exo-hunhan-baekyeol-kaisoo-chanbaek

Sehun with his cute lisp and luhan is just being luhan lol