I nominate this oneshot: http://www.asianfanfics.com/story/view/896615 (psychological ft Chanyeol and OC)

Teaching the cold-hearted luhan to fall in love - luhan
Don't fall in love with me - baekhyun
Silver heart - luhan
My gangster - sehun
My 12th brother - luhan
My life as his babysitter and wife - luhan
This forced marriage - baekhyun
Except you - baekhyun
6720 hours - baekhyun (going on)
Teach me what love is - baekhyun (going on)

can i recommend you a story?
it's still on-going and the author has not been updating, (still waiting).
it's a little sad story about Chanyeol and an OC
http://www.asianfanfics.com/story/view/1056371/behind-the-screen-romance-chanyeol-chanyeolxoc-songkyungil

can i recomend you one of my fav kris story?
kris as the bodyguard..the story is so fluffy^^ its already complete
http://www.asianfanfics.com/story/view/1119408/adumbrate-daisy-fluff-romance-originalcharacter-luhan-baekhyun-chanyeol-kris

Thank you so much for the recommendation of "Letters of Reminiscence" :') I'm glad you liked it enough to endorse it in your list!