Saibiyaku ~Miseijuku na Shoujo o Hatsujou Saseru Kusuri~
Original title: 催淫薬 ～未成熟な少女を発情させるクスリ～
Unattractive and trapped in his career, a company man turns to drugs. Not on himself, but on high school girls.
The drug is "hypnodisia", inducing estrum in girls who sate their lust on his c*ck.
They might resist, but the instant effect of the drug makes orgasmic slaves of the pretty girls.
Who knew this sort of life was possible......