[Satuyo] Zutto Matteta Zenpen (COMIC LO 2020-06) {Hennojin}

A kindergarten teacher's quiet days are upended when Hikaru—the tomboy he once knew, now grown into a young woman—calls out to him at the school gate, invoking a forgotten promise he can barely remember. Flashing back to her childhood, the story follows the demanding six-year-old as she corners him in the restroom insisting he wipe her clean, coaxes his fingers between her thighs at naptime because she 'feels itchy down there,' and turns shark-encyclopedia story hour in his lap into breathless grinding that leaves her squirming and him begging her to hold still. First part of a teacher-student affair where the pint-sized shark expert calls every shot and her flustered, apron-clad sensei never stands a chance.