For Ecchi Masakazu Katsura manga such as Video Girl Ai, I's, and DNA.
For Hentai Shiwasu Okina hentai manga such as Nosewasure, Shining Musume, Pisu Hame.
At the moment it's between Kon-Kit (Konsoul) and Mikami Cannon
Manga, Hm.... maybe the artist who drew Prison School. The ladies are so yummy, then Luv P, a manhwa artist and the guy (I forgot his name) who did Kill the dead bastard.
Can't say I read adult comic much but if normal ones or manga, my favorite will be Kuroshitsuji. As for H-ones, there's lots but I'm keen to Hisasi, Momi/Pyon-kti, Ishikei, Clesta and Wata120 Hs
Hentai: works of Homunculus, Napata, Hisasi, Kojima Saya, Katsurai Yoshiaki, Gujira, Meme50, Hamao, Shiomaneki
[to name a few XD]
Magazine: X Eros, Kairakuten, Comic ExE, Shitsurakuten, Girls for M, etc...
The girl isn't drawn like it's a victim bulimia, it doesn't have tits that might crush buildings and it's going pretty crazy on this guy.
It was one of the first doujinshi's I really liked.
Releases by Bunny Walker usually never disappoint. Their latest iteration of - Youkoso Sukebe Elf no Mori e - was quite nice actually and it was very much inline with the source material.