Professor Strangelove, Volume 2

Hayama is a struggling student who has been drugged by the eccentric Professor Shiina, who is known as a genius, with "a drug that facilitates love," which causes a sticky love situation. In exchange for making an antidote to the drug, Hayama is assigned to be the professor's assistant...? The professor sexually harasses Hayama, who is presumed to be a virgin, and his chastity (?) is threatened!