When I started reading hentai manga. I was drawn to it by both the story and artist. I really liked how the story was told. But I really liked the way the art work was done.
One of my favorites is Saigado. The first hentai manga of his I read (it was translated into English), was Hana's Holiday. I really liked the art work that Saigado does and all of his subsequent works are really great too. The situations he puts them in is great and he adds some humor to it as well.
Another Author/artist I first saw was Umino Sachi. I liked how they drew his women with big breasts and bodies. Also, the stories he has them are always a trip. The fist time I saw their work was with Hokemon. I really liked the school nurse and her sexual escapades at the school.
One of my favorites is Kitazato Nawoki. The first one of his manga I read was the Yuna A Widow. It was very good. I liked how he draws his women. It looks like they are very real. I really like is work over all.