Intrigued by her beauty and charm, Hikaru falls head over heels for teacher Water. She eagerly joins the club under the pretense of learning womanhood, unaware that she's about to embark on a journey filled with sadistic lesbian discipline and humiliation at the hands of her 'older sister'. As Hikaru succumbs to the allure of their perverse lessons, she begins to crave punishment herself, leading to intense spankings, classroom embarrassment plays, orgasm denial, strap-on penetration training, naked wandering, and even cleaning her pussy after using the bathroom. Meanwhile, Water becomes increasingly aroused by Mistress Minazuki's submission and starts seeking out more intimate encounters with her student... Together they drown in a sea of yuri and SM squirting lesbian orgasms! Note: Content may vary depending on distribution method.

「…合格よ。貴女、私の部活に入りなさい…」美しく気品溢れる女教師 潤に一目惚れをしてしまった ひかる は誘われるままに入部が決定し…女性らしさを学ぶ名目で先生―――’お姉様’の厳しくいやらしい調教とお仕置きの日々が始まる。妖艶でサディスティックなレズ調教に悦びさえ憶えてしまうひかるは、自らもお仕置きを求め始めて…スパンキング、授業中の羞恥プレイ、快楽失禁、ペニバン調教、裸徘徊、トイレ後のマンコ掃除など、恥ずかしいレズ調教にMな心を目醒めさせ、潤も興奮した様子で生徒の身体を求めていき…2人で溺れてゆく百合と百合のSM潮吹きレズビアン！！※ 配信方法によって収録内容が異なる場合があります。