http://archiveofourown.org/works/9257444 (19k words. one of my favorite fantasy AU's, it deals with prince shiro and his protector keith. it does have a sequel)

http://archiveofourown.org/works/12610872/chapters/28728112 (30k words. this one is recent because of the shiro big bang going on, it has bottomshiro so i can already tell it's going to be great. keith's a dragon, and shiro's a knight)

http://archiveofourown.org/works/11506032 (15k words. shiro stumbles into a demons lair)
http://archiveofourown.org/works/11719146 (4k words, knight keith feels as though he failed to protect the prince)
http://archiveofourown.org/works/11659164 (2k words, shiro agrees to help a blacksmith out)
http://archiveofourown.org/works/12471672 (2k words, knight shiro with prince keith)
http://archiveofourown.org/works/9549968 (1k words, keith wants, prepare for angst)

http://archiveofourown.org/works/11840304/chapters/26726964 (58k words. keith wants to follow in his fathers footprints and ship in the skies, shiro is a cook. i love this one, highly recommend reading)

http://archiveofourown.org/works/8029366/chapters/18386050 (160k words, HNNNNNNG still my absolute favorite sheith story and it's been months, so many many months. you probably already this one but just incase, it deals with slave shiro, and knight keith. that's it, i'm not gonna spoil, please read it, please)

http://archiveofourown.org/works/8978134/chapters/20526931 (39k words, keith is the snow prince that can't feel, shiro is just someone who wants to save his people, and dogs)

i love fantasy AU's, not big on highschool/collegeAU's but hopefully someone will rec you fics in that genre. happy reading!