Treacherous Heart, by DancingDragonBlaze is changing my mind about Naruto fanfiction. No longer are we limited to overused stroylines, out-of-character-ness, and WTF?! yaoi. Her fluffy, angsty romance is by far one of Fanfiction.net's best. 
     Without giving the juicy details away, Treacherous Heart is a Sasuke-centered fic that takes place somewhere after or during the Shippuden Arc. (Admittedly, I've never read Naruto, so I'm not totally sure how long that arc lasts.) Sasuke, still living in the Sound Village, is stuck in a tug of war of his heartstrings. Its either his current lover, Kabuto, who touchingly provides that fluff I love so much, and his previous lover, Kakashi. I had never read a KabuSasu before this, and I honestly didn't know how it could work. I was pleasantly surprised to find that it did. 
      This fic, which is still being continued even after a whopping 38 chapters, is rated M. I agree with the rating, but not because there's explicit hard-core yaoi action. Its more for the language (provided mostly by our prince of angst, himself), violence, rape, OroSasu (which by itself ought to equal an M) and of course the, in this case tasteful, boy/boy action. You could also include the hints of previous shota that are sprinkled throughout although I don't think that the present story would be considered shota (Sasuke must be in his late teens by now). 
   I would definately recommend this fic to any Naruto yaoi lover. As DancingDragonBlaze puts it, this story puts the 'uke' in 'Sasuke'.
    Here's a link to the story, http://www.fanfiction.net/s/3203454/1/