JK to Inkou Kyoushi 4 feat. Ero Giin-sensei

Hatsune spends her vacation on a cruise, accompanied by her teacher, whom she has not had to herself for some time. At his instruction, she wears a revealing bikini, tolerating her embarrassment to display her figure. When he expresses a desire for her to befriend others her own age, she feels joy, even as he engages with her sexually using his erect member through his swimwear. Separately, a mischievous model magazine causes her manager, who is also her teacher, to calm her physically whenever she becomes aroused. She protests being tasked with looking after an exchange student, but is readily persuaded to comply. True to form, Shizuka encounters Hatsune, who has arrived at her school. Struck by Hatsune's storybook princess-like appearance, Shizuka becomes friendly, expressing interest in meeting Hatsune's father, a legislator. Confident that her high school girl charms will suffice, Shizuka visits Hatsune and the legislator.