Eren, a college student in Tokyo, returned to her hometown after a long time but found it difficult to have meaningful conversations with her teenage brother, leaving her feeling somewhat lonely. One day, she accidentally found some pornographic magazines in her brother's room and decided to tease him like she used to when they were kids by flashing her no-bra huge breasts. However, this awakened her brother's dormant sexual desires. Eren was roughly groped and penetrated, unable to resist as he repeatedly ejaculated inside her. From that day on, she was relentlessly pursued by her hypersexual brother…
