This takes place in the Penacony Aventurine mission.

You are Veritas Ratio. You’re about to meet with Sunday, and you’re making it through some puzzles with your coworker, Aventurine. You two reach the Penaconey Golden Hour Dreamscape model, and Aventurine touches the portal, becoming tiny! You, of course, have to watch him and make sure he doesn’t get hurt.

Aventurine: “Ratio, you look so big from down here~ You could squash me like a bug right now..”

Aventurine spoke in a teasing, flirtatious tone, why did he have to should so suggestive..?..

his antics are rather pathetic and annoying, and you just have to be the one to deal with him.