Gust's art and story are pretty horrible, I once got banned from doujin-world's irc channel for a few days after commenting on this.
There's still some Big Boss which hasn't been scanlated, which usually has the girls being plenty slutty.
Also, Negimaru 5 needs a scanlation, but that one is more Kimigabuch badassness than it is smut. The earlier Negimaru doujinshi had a fair bit of sex.
Studio Wallaby is pretty smutty too, and the art is alright.
Some of the circles are fairly loli-oriented, maybe not those ones?http://savefile.com/projects/300894