So Lil bit of lore on Villo:

He's designed to hold onto Rei's/My excess reserves of magical energy since their body cant handle it.

As A Result Villo is often subjected to random cases of bloat where they go from 2 feet tall to the size of a bean bag chair or larger and wobble around for a while. Eventually the magic gets processed and spent by the demon naturally feeding off it but it can lead to some silly situations. And occasions where Rei uses them as a seat and/or stress ball.

Enjoy~!

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Artwork © Trinitylight