They're not from Nekopara but from a game called Rabi-Ribi (Nekopara's black cat is called Chocola, not Chocolate). Btut you are rigth, there isn't a Nekopara tag yet.
@Hululu creo muchos lo hacemos porque el sitio es de habla inglesa, pero la comunidad de habla hispana en Dynasty es más grande de lo que uno cree en un inicio XD
...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).