Saibiyaku ~Miseijuku na Shoujo o Hatsujou Saseru Kusuri~

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......

[From DLsite English]