How does Jess (your wife) feel about being more open about it? She's the one who has the right to decide how to present her marriage to her own parents (your in-laws).
Just from reading your blog, I have the sense you want to proclaim your love for Dawn from the rooftops. You feel like you are hiding an important part of yourself from the world. But here is some food for thought...
Your relationship with Dawn is very kinky. That's not something one can normally be open about at work or church anyway. So there will always be an aspect of your relationship with Dawn that is hidden from the public, yes?
Would you also feel like you are hiding an essential part of yourself if you weren't able to tell people about Jess (your wife)? For example, if you interact with Dawn's family/friends, do you tell them you're married? If not, do you feel like you are hiding an essential part of yourself? Do you feel like you want to tell everyone in Dawn's life about how wonderful your connection with your wife is?
If not, why do you feel the need to tell everyone in your wife's life about Dawn?