Hidoku Shinaide
Ongoing | nekota yonezou | 2007 released
This starts out utterly rapetastic, but actually the main couple evolves into a truly sweet, kinky, mutually supportive couple. There is a lot of handwaving as to how they get there from how they started (though they do actually talk about the rapey history later in the series; but again it's too easily ignored). Still, this is one of the series I have most enjoyed. The art is great. And she comes up with some truly creative and utterly hot sex scenes.
Bi No Kyoujin: Smoke