I mostly peruse the works of Japanese erotic artists, but even then, it's hard to choose just 1. Distance, Butcha-U, Ishigaki Takashi, so many good ones. But if I had to say, I'd say Ashiomi Masato. Incredible artist, and I even greatly enjoy his older works. The erotic level of his works maintain a high level, even throughout his works where he's incorporating a captivating story. Some artists that do that lose sight of what they're actually trying to do when focusing on the story, but this isn't a problem for Masato. I know that whatever I'm reading from him, I can count on it to do the job, lol.