ADN-810 — This is the story of how my senior at university became my sex friend (a pacifier-giving buddy) for the last few months before graduation.

I'd been single for 20 years, and I was a loner even in the university research lab. It was Amamiya-senpai who spoke to me at that time. Having no experience with women, I immediately fell in love with my senior when she was kind to me. But my senior had a boyfriend, and all I could do was watch her from afar... Then, a turning point came for me. A senior who had finished job hunting invited me out for drinks, and we ended up sleeping together that night. I thought it would be a one-time thing, but my senior said, "It's okay if we're just friends with benefits," From that day on, we became friends with benefits.