My favourite hogwarts era smut fics:

Advanced Charms by paraphilia.
http://www.the-archive.net/viewstory.php?sid=4632
This one edges onto fluff in that it's not full of biting and hate but there's no pet names or love yous or anything. it's a Harry POV and I adore it because it's hot as hell but also full of that sense of wonder that comes with first sexual experiences. I've read it many times.

How to Handle an Enemy by who_la_hoop.
http://asylums.insanejournal.com/hp_wankfest/7220.html
Hot hot hot wank fic with Harry and Draco and some Slytherins. Draco POV, with brilliant captured voice and characterization. And did I mention it's hot. Also has garnered many rereads.

The Porn War/The Challenge by lady_vader.
http://www.livejournal.com/tools/memories.bml?user=dreambastion&keyword=Porn+War&filter=all
This one is long and a little more on the rough side. There's a touch of dub-con at the start but mostly it's hot boys full of rough love. And then an emotional hit that catches you off guard at the end.

I couldn't think of any for your other requests but I hope you enjoy these. I'd start with How to Handle an Enemy. It's WIN.