A record of a simple big-breasted college girl's 'sex-length' with her big-breasted sister with a sexual desire that surpasses her virgin boyfriend's. Hongo Ai

The story is about a virgin protagonist who is bewildered by her transformation, but learns of her precious feelings and gets together with her. Her transformation was erotic and the development was interesting, but it was nice to enjoy both the plain girlfriend and the flashy girlfriend. It may be scary in real life, but I look forward to the next one.