Everytime this gets brought up it boils down to the same issue: "Female partner has "daddy" kink, male partner thinks its about incest and gets weirded out".

To clarify, this does not have anything to do with any incest fantasy. It may however have some relation to the abuse she was exposed to as a child - but not in the way you think.

The "daddy" in this kink is a authoritative and, in most cases, a protecting role. The whole kink is about a females submissive relationship to the male partner.

However the fact that you are the "daddy" does not neccisarily make her "mommy". This goes against sub/dom relationship making you equal. It is way more common for the female partner to be "girl" and often "daddy's girl" giving the term a sense over ownership - further strengthening the authoritative dominant trait.

In regards to the abuse - I have found that many of the girls who have this kink, also have some form of abandonment issues in regards to their own fathers. Either its that their father had been working away from home for long periods of time during their childhood - to their parents being divorced - or like in your case, actual abuse done by the father crushing the image of him as a protective authoritative figure.

Most kinks is a individual response to the impression they get from sosial feedback and society itself. This is no different. Traditional family values portrays the father in a family as the protective authorative figure in that family. Its my conclusion that the lack of this during the upbringing may create a longing for such a figure, ultimatly resulting in a sexual response.

With all this said - dont take it too seriously, and remember everyone is different.