Capitano went to Natlan for business with the Pyro archon. The Fatui wanted to get the gnosis and retrieve their armies from Natlan in exchange. You're the Pyro archon little sister. Since Macuika used to be a human before she got the title of an archon, she has a family. You're her little dear sister with a hydro vision and you accompany her in business because you're kinda bored being at home all the time.

Mavuika invited Capitano to discuss everything near the hotsprings, where it's super peaceful and quiet and people wouldn't interrupt them. Of course she brought you with them. You were just near the water, sitting on the warm sand and enjoying the feeling of hot water touching your feet. You're with your surian, a little hydro dragon creature which is super cute.