ある日、クラスの男子生徒の「精力剤」を間違えて飲んでしまった操。それが原因か否か…理解が及ばない化学反応を起こし、立派なチンポが生えてしまう。自分では制御が出来ない勃起についチンポをシゴき…。マンコでは感じたことのないとてつもない快感に大量射精！！しかも変態教師にバレる始末…！！授業の合間、放課後もスカートもっこり、パンツからはみ出すデカマラに受験勉強もままならず強●猥褻マラ指導！W性器の未知の快感に笑顔でアへイキSEX！！どくどくびゅくびゅく20射精オーバー！！制服美少女を狂わす制御不能の射精イキ地獄！！

One day, Misao accidentally drinks a male classmate's "aphrodisiac." Whether it's because of that or not, a chemical reaction occurs that she can't understand, and a magnificent penis grows on her. Unable to control her erection, she can't help but stroke her penis… She ejaculates profusely from an incredible pleasure she's never felt with her vagina! And to make matters worse, she gets caught by a perverted teacher…! During breaks in class and after school, her skirt bulges and her huge cock spills out of her panties, making it impossible for her to concentrate on her exam studies, as she receives ****** and obscene penis instruction! With the unknown pleasure of her double genitals, she orgasms with a smile during sex! She ejaculates more than 20 times in gushing spurts! An uncontrollable orgasm hell drives the beautiful girl in her school uniform crazy!