My favorite fanfic would have to be Definitely, Maybe Other Mother. It's one of the best in here.

My ultimate favorite would be Risk vs Reward followed by Milk Moustache.
Out of the YulSic focused fics would be probably Ocean Away. I think MM & OA are only on soshified though.

Anything dat hav YulSic n YulTiSic in it LOL

My favorite YulSic fictions are
Raveeeeen123's one shots
SSF's Fictions are Made to be Real (seriously! i strongly recommend this!)
Yulsic and Taeny Shots by Kiryuu
Personal Differences
Virgil's stories
Black Rose's
The Queer Life of Kwon Yuri
Kwon Yuri's Property
and!!!
INFINITYPENGUIN's!!!

Yulsic offcourse! ^^
Well... I love Black Rose's, Keyuen's, Drejin014's and Xtina26's.
They all really good on making drama ^^

Sorry I cut off my last comment.

PURE LOVE is a good taeny fanfic but it's rated M

PRETENSE is pretty good Taeny and Yulsic fanfic (rated M I believe)

Also PERSONAL DIFFERENCES is amazing Yulsic, taeny, sunyoon, and hyohyun fanfic but its rated M

THE ROYAL FAMILY is a good Taeny centric one and its not rated!

THE QUEER LIFE OF KWON YURI is a hilarious Yulsic, and taeny fanfic (Its not rated but its a bit naughty)

Ice Breaker 1 and Ice Breaker 2 are good Yulsic fanfics


10 STEPS TO MAKE YOU FALL IN LOVE WITH ME is a good Yulsic fanfic (RATED M)

PURE LOVE is

My Favorite is Yulsic well my favorite fic is the fruit of out mistake well I have two but the oh her one is sad.

my fav is Yulsic ! same like u..my fav yulsic fiction to much..

Ani my favorite is Yoonyul <3 I don't read other fanfic except yoonyul fic :D