At the Anal Portio Clinic, a girl with no prior anal sex experience is gradually developed through intense training. Initially resistant, she slowly becomes aroused through anal fingering and humiliating discipline, eventually begging for creampie by saying "It feels so good!" and "Cum inside me!" Successfully transformed into a masochistic woman highly sensitive to anal stimulation. Unlike typical AVs that use kidnapping via sleep induction, this work realistically and meticulously depicts the authentic process of anal training and development.