It is easy to judge a story when you are in the middle of it.
Catherine created a situation where she owes the MC a significant amount of $.
She also chose to be antagonistic towards the MC until the point when he suddenly became of use to her (revealed as a founding family member).
The MC has given her two ways to pay this back - dishwasher and special Princess services - Catherine's choice on the mix.
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He could have called the police and had Catherine charged but he did not.
He is allowing her to preserve her
public dignity and the public dignity of her family.
Catherine gets to choose the type and timing of 'bonus' payments on the debt - which you can see has no interest.
The MC does not keep secrets from his women - he has made this clear.
You are saying he should make a special exception for Catherine ('
the MC could've just made a deal with her behind closed doors'), effectively damaging his relationship (and breaking his promises) to all the other women he is with.
Catherine wants to join the harem, and she will need permission from every other gf of the MC's before this happens.
Do you see the other women accepting Catherine into their 'family' when she is treated differently than they are/protected differently than they are?
The MC has been very clear about how he treats his girlfriends and what it takes to become a girlfriend.
In this story - Catherine has decided that she accepts this, and she wants to continue to pursue the MC for marriage.
Back to this being the 'middle' of the story.
Let Cosy tell Catherine's tale through time, seeing how she evolves from an entitled Princess to someone who the MC enjoys enough to claim as a girlfriend as well as someone the other women enjoy enough to want to share the MC with her.
Cosy Cafe is a story of with a number of facets, including how the different characters grow through time.
I think we should let Cosy tell and show us Catherine's growth through time before judging her journey.
Cheers!!