The Seven Habits of Highly Effective Dark Lords by AbstractConcept
(Rating: R )
Harry is the new Dark Lord. He rules the world with a compassionate and well-intentioned fist.
SS/HP, mentions of HP/DM. Mentions of character death, but still a very light fic. Humour/Romance/Smut.
http://www.astronomytower.org/restrictedsection/fic.php?fic=at:/authors/abstractconcept/SHHEDL.html