Simon and Louis have a seemingly very casual relationship, where Simon will bluntly state the things he thinks about Louis. When he's in a bad mood, he got annoyed with him and ripped his beard, which greatly startled and pained Louis. He will invade on his personal space without much thought or shame, seemingly believing that he has the right to. The two are colleagues but it is hinted that they have a different relationship, of a more sexual character, which is later confirmed by Kato Kotono. Simon seems to understand Louis quite well compared to many others and it is shown that he worries for him. He also refers to Louis by his first name Virgilio.