Nanoka, a student in the life sciences department, is a serious and research-oriented science girl. She is pure and incredibly beautiful. After the usual lecture, she stops me. She says she wants to continue the experiment... or something like that. I followed her sudden invitation into an empty classroom. I thought it was just a continuation of the previous experiment... but as she touched my hands and arms to check my reactions, she reached for my cock before I knew it. "I wonder what kind of reaction you'll show." She gave me a handjob while playing with my crotch, naturally stripped off my pants, and even gave me a blowjob... I thought she had absolutely no interest in erotic things. But it seems I was wrong. From that day on, our secret experiments for just the two of us began. Bound and with my privates exposed, I was left at her mercy—sucked, licked, and fucked... She used aphrodisiacs to get more stimulating reactions while fucking me... Over and over again, I was made to cum as part of her "experiments." Through her, I tasted new experiences, and my sexual fetishes gradually began to change...