Jealous wives

[Yerdiss]

Hello there,

After reading the forums, I got the impression that the Kraken combat is only initiated after asking Mirabella into wedlock. In my current (and first) game, I'm quite happily married to the frog-lady. So I wonder, if I casually ask for Mirabella's hand, will my current wife become jealous and throw a tantrum? I would fancy fighting the Kraken, yet would dislike losing my current wife over it.

To summarise: Is my assumption correct that asking for a wedding with Mirabella is the only way to the Kraken? And if so, can it be done without risk of losing the current misses?

Cheers