I think some people are overthinking it. The comment about his height is to show he lied about his age without the bottom thinking twice. Same reason why he ordered fucking soda instead of an alcoholic drink after the wedding and why he said he's a student. The problem is that bottom met him when he was 15 years old, meaning he was crushing on a 10 yo kid











You can find the fan translation of this manga if you search for Itte Owari na Wake ga Nai