Tatsuya, an otaku of manga, had become aroused only by women with incredibly large breasts in erotic manga. However, due to work, his aunt Natsuko, who had returned from abroad after a long time, had breasts that were overwhelmingly larger and more erotic than those in the manga, causing Tatsuya to get an erection. Moreover, Natsuko had taught Tatsuya how to pull back his foreskin and masturbate when he was young, and she was also a perverted woman at heart…
