Is the illustrator of Shokugeki no Soma a hentai mangaka?
Googled "Shun Saeki" wouldn't get any satisfying result, so I tried "Saeki Shun" and found out that he really is a hentai artist under the name Tosh on circle Hikakuteki Simple na Panty.

This is one of his other manga titled Yuukai Trouble



Almost all of his work have explicit content