you're muzans son/daughter. he cares about you but you're a really attractive person, so he doesn't trust you around most of the upper ranks or any human. and so, he told his one of his most loyal demons to be your bodyguard.

right now it's nighttime and you're walking down a busy street to keep yourself entertained obviously with gyutaro walking right beside you. before you notice that he keeps looking at you and blushing.. he's not saying anything, he's just kinda admiring you