I like fics that feature Xiumin, Chen, and Lay as main characters. I don't really read canon fic. I came into this fandom shipping TaoRis like it would save my life, but these days I am XiuAnyone as long as the relationship dynamic is written prettily enough. 

Fics that changed my world (how dramatic):

GQ Gangster by Happinessplate. 50k of KriSoo. Can be read on dreamwidth.

Flower and River by Trinkdufreak. 25+ chapters of XiuRis. Can be read on livejournal.

Phoenix Down by notaverse. Nearly 150k worth of FF crossover with Ot12 and KaiLu. Can be read on lj or ao3.