Top of her class with A’s in every subject including sports but just enough lacking of common sense to find herself being the fuck toy of the track and field coach.
Rikujoubu Joshi wa Ore no Nama Onaho 1

Shizune excels academically and athletically, yet her innocent naivety makes her oblivious to Coach Takashi’s predatory advances. Drawn into his twisted desires, she unwittingly submits to his relentless dominance, becoming his eager plaything after practice sessions. Despite her pristine reputation, Shizune surrenders completely, craving his rough touch and filling her days with secret, illicit passion—her body molded into his obedient flesh toy, aching for every forbidden encounter.