女教師・五条先生は修学旅行の引率のために地方の温泉に来ていた。友人たちは婚活などを楽しむ中、自分は仕事の毎日。彼氏不在、婚活も出来ない…日常のイライラを温泉で流そうとする中で、生徒の優生が間違えて女湯に入ってきて…まさかまさかの相風呂！地味な五条先生の服の下に隠れていたのはデカすぎるおっぱい！！思春期盛りの優生はたまらずデカ乳に貪りついて…まさかまさかの流れでSEXまで…。「まぁ…1回だけなら、ね。」そう思ってたのに生徒の若い絶倫チンポに熱冷めやらず修学旅行そっちのけでハメまくりラッキー青春中出ししまくり！！

Female teacher Gojo-sensei was at a hot spring resort in the countryside to chaperone a school trip. While her friends were enjoying dating and other activities, she was stuck in a routine of work. No boyfriend, no dating opportunities… As she tried to wash away her daily frustrations in the hot springs, her student Yuusei mistakenly entered the women's bath… and they ended up sharing a bath! Hidden beneath Gojo-sensei's plain clothes were enormous breasts!! Yuusei, in the throes of puberty, couldn't resist and pounced on her huge boobs… and things took an unexpected turn, leading to sex… "Well… just once, right?" That's what she thought, but her passion for her student's young, powerful cock never subsided, and she ended up having sex with him repeatedly, forgetting all about the school trip, enjoying a lucky youth filled with multiple ejaculations!!