ROYD-357 — My childhood friend, who just got her first boyfriend, asked me to practice fellatio with her, so I trained her into a toilet for the back of her throat with counter-irrumation. - Otonashi Suzu

When Yuta returns home after a long absence, he learns that his childhood friend, Suzu, has gotten her first boyfriend. Although they had never thought of each other as members of the opposite sex since their school days, Yuta feels a little conflicted. Suzu then asks Yuta to be her practice partner for oral sex. Although he initially refuses, he is persuaded to help Suzu practice using a dildo, saying, "I'm not going to do it with the real thing!" Suzu practices diligently for her first boyfriend. However, driven by jealousy, Yuta lies to Suzu, telling her that rough irrumatio is "normal"...