Seduce & Swindle.

Lady-killer Ikki Fujisawa uses his boyish charm and his obvious skill at cunnilingus to habitually seduce and then swindle societal elite women out of millions. Keeping a close eye on Ikki's adventures in the hope of a slip-up is a thick-skinned detective who resorts to collaborating with a renowned retired conman in his pursuit of this libidinous criminal.