My childhood friend, who was my first boyfriend, actually told me she wanted to practice oral sex, so I retaliated with deep throat training, turning her into a sex toy deep in my throat. (ROYD-357)

Yuta, returning to his hometown after a long absence, learns that his childhood friend Rin has her first boyfriend. Although they haven't considered each other as romantic partners since their school days, Yuta still feels conflicted. At this time, Rin asks Yuta, "Can you be my oral sex practice partner?" Yuta initially refuses, but Rin says, "I won't do it for real!" So Yuta has no choice but to practice oral sex with Rin using a dildo. Rin practices very diligently for her first boyfriend. However, out of jealousy, Yuta performs intense deep throat oral sex on Rin, lying, "This is the normal way..."