IPZZ-921 Sakai-senpai, who trains me at the swimwear company, has a body rivaling that of a glamour model when she strips down; I get an erection every time I see her trying on swimsuits, but she’s secretly a closet pervert who gets turned on too—and she’ll find any excuse to have sex with me. Mio Sakai.

I landed a job at a swimwear company. Having seen an adult video where the staff all wore swimsuits, I arrived at work with wild fantasies—only to be disappointed when reality turned out to be everyone wearing ordinary business suits. However, I learned that trying on the swimwear was part of the job, so I immediately joined my mentor, Sakai-senpai, to test out the new collection. I was stunned when she stepped out in a swimsuit; she had a slim figure and a massive bust—something I never would have guessed from seeing her in her work clothes! Oh no... I'm starting to have erotic thoughts and getting an erection...! I've got to pull myself together!