Sensei to Joshu no Renai Do Sukutei!

The eccentric associate professor Sayama's hobby is to carry out erotic experiments. As a test subject, his assistant Kigure is made to moan daily using adult toys and aphrodisiacs! He was supposed to be a half-guilty partner, but he's not. But when he says things like "It has to be Kigure-kun", he starts to get nervous, whether it's because he's a respected professor or because of the experiments he's been doing...?