...actually I wonder now if that joke wasn't a snarky reference to some of the more obscure powers attributed to the demon king in some grimoires, namely "command over fish" and "remaining underwater indefinitely"...
^^ Indefinitely is definitely (HA!) the right word to use in the provided context. Indefinitely just means an indeterminate amount of time (i.e. - as long as she wants without a set limit).
I looove extreme size gap when the ship is fond and fluffy, and I love their banter, so yeah, I fuck with this! The art and scenarios here too, it’s so... decadent. I really really really like this image.