久々に帰省した裕太は、幼馴染の鈴に人生初の彼氏ができたことを知る。学生時代からお互い異性として意識はしていなかったものの、少しだけ複雑な気持ちになる裕太。そんな裕太に「フェラの練習相手になって欲しい」と相談を持ち掛ける鈴。一度は断るものの「本物でするわけないでしょ！」とディルドを使って鈴のフェラ練習に付き合わされる裕太。初めての彼氏のために一生懸命練習する鈴。しかし裕太は嫉妬心から鈴に激しいイラマチオを「これが普通だよ」と嘘を教えてしまう…。

When Yuta returns home after a long absence, he learns that his hood 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"…