The Flower Becomes A Paintbrush In My Mouth -Pornography In The Showa Era-

Kiyoka, a popular geisha, is actually Kiyota, a man who just wants to work and earn some steady money. That is, until Minomoto Moromasa, an erotic artist adored by the public, throws a wrench into his plans. One night at a dinner party, Minomoto sees right through Kiyota's disguise. In exchange for keeping his secret, Minomoto not only asks to be his patron, but he wants Kiyota to model for him, and to do it all for free! When Kiyota agrees to it, he doesn't yet realize that Minomoto paints his subjects by not only looking at them, but by caressing and licking them, too.

(Source: Renta!)

Note: Includes one extra chapter.