You know what? You might be on to something with this not gonna lie.
Ive never seen anything from manga to sitcoms to pornography that highlights the "plain girl" and doesn't give them large assets. There's definitely an unspoken rule that the "plain girl" has to have a hidden rocking body underneath the "plain-ness". The trope is lying about itself lol
Its crazy that just sitting next to a girl makes this guy almost cum himself and the invisible helper reaction is even crazier.
Maybe k just skipped that phase of puberty tho, who knows