[Eichi Kenkyuujo (Blank)] Omocha Kaihatsubu Buchou wa Jibun de Kaihatsu Shita Omocha no Jikkentai kara Bai Gaeshi Sareru You desu (SCANMTL)

A department head becomes the central subject of her own toy-development project when a series of eagerly escalating encounters turns her ample figure into the punchline. She moves from startled resistance and breathless “W-WAIT…” protests to sweating, spiral-eyed surrender as toys, fellatio, and relentless penetration drive repeated orgasms and squirting releases. Set against an academy where unusually explicit behavior passes as everyday strangeness, the exaggerated comedy turns a self-inflicted experiment into a spectacular lesson about invention gone wrong.