I hope you like some of these....and that I didn't include plot lines that you don't care for.... 
Vindico Atrum by FirePhoenix8 at fanfiction.net  http://www.fanfiction.net/s/4582846/1/Vindico_Atrum 
Harry/Tom....very sexy....dark humor and Durmstrang goodness.  
Founder's Keeper by trillium248 on fanfiction  http://www.fanfiction.net/s/4484950/1/Founders_Keeper 
Harry/Salazar...clever plot and timetravel surprises 
Disenchanted by Cluegirl at skyehawke  http://archive.skyehawke.com/story.php?no=...7&chapter=1 
Harry / Severus...not long but well written and cool 
And I know you said that you don't like Harry/Draco but this completed series has some Severus thrown in as well and definitely got the dom/sub thing going on. Indago by LdDurham at skyehawke 
 http://archive.skyehawke.com/story.php?no=8094&chapter=1 
Basically anything by Icarus is like waking up to the winning lottery ticket, but here are my favorites, and they are all part of the same universe created in.....(!!) Primer to the Dark Arts  http://www.fanfiction.net/s/1069913/1/Prim...o_the_Dark_Arts 
Harry / Severus and so well written that you ache 
Cursed Artifacts for  Sale http://www.fanfiction.net/s/1753258/1/Curs...efacts_For_Sale  
Drunken Domesticity on fanfiction.net  http://www.fanfiction.net/s/1244318/1/Drunken_Domesticity 
Harry / Severus : they fight and makeup but in such a cannon, snarky, AWESOME way that you shiver 
A Scandalous Interview http://www.fanfiction.net/s/1459375/1/A_Scandalous_Interview 
And maybe you'll enjoy some of the fics written by DementorDelta on skyehawke  http://archive.skyehawke.com/authors.php?no=95 
Happy Reading! 
~Chanel