Twilight just wanted to get an answer to another question she had about taking over Equestria from Celestia and Luna. What she did not expect was to walk into the two of them engaged in something she had always thought was taboo between siblings.

After Twilight composes herself, Celestia and Luna feel it is only fair that they explain their relationship to her, in order to see if they can't win her approval, and, failing that, to get her to understand why they entered into such a relationship in the first place.

Written for DarkRyu's April 2019 Sibling Incest Contest.

Cover art to be added... once I can find something for it.