How old is she? She is definitely young, but is she a high school girl? Or is she younger? She is still young and innocent, and looks like a perfect match for those who like lolicon. This beautiful girl, who is exactly in between an adult and a child, stands out even in her casual clothes, not in a uniform. I felt a woman in her expression as she walked with a man who seemed to be her father at a tourist spot out of season, and when I listened carefully, I heard her address the man as "teacher". It seems that the teacher in his 40s or 50s and the young girl were on a sightseeing trip alone. This work is a document of two people who crossed a line that should not be crossed. [Konatsu 10 years old] A third-year high school student who belongs to the brass band and is set to enter a private high school in the spring. Last summer vacation, she grew nearly 10 cm in height and her breasts grew rapidly, and her chest circumference was measured at a recent health check and was 86 cm. She has never had a boyfriend, so she is still a virgin, but she woke up to sex about a year ago and masturbates twice a week. Recently, she has started masturbating with her fingers instead of just her clit, and the day before the trip, she inserted two fingers. [Teacher A] Your alter-ego, who you suppress as a sin that should never be committed. [The first and last immoral trip of your life] When Konatsu appeared at the meeting place, she had a different atmosphere from the school, and had the sexiness of a woman. Teacher A felt that she was prepared for what would happen today and what kind of experience she would have, and with each passing second, Teacher A lost his sense of reason. For one night and two days, they stayed alone at an inn famous for its private open-air bath, and Konatsu's first experience began. [Contents] (1) Meeting - sightseeing - Teacher A's sexual desire is at its limit when he sees Konatsu's large breasts visible through her clothes - he checks into the inn and immediately has sex for the first time (2) Konatsu blushes as she goes to the famous open-air bath, and says that her first mixed bathing experience is more embarrassing than having sex - she enjoys her 86cm bust with a titty fuck and blowjob (3) Teacher A brought adult toys with him so that he could have various first experiences, and Konatsu climaxes when he is stimulated with a vibrator and electric massager - blowjob and titty fuck (4) The morning after indulging in sex all night, they have intense sex while kissing passionately as if they are reluctant to say goodbye