After Twilight's absorption of the royal sisters she has the clarity to ask Cadance how this came to pass. Cadance, always the one to enjoy telling lewd stories, shares how the fate of the Crystal Empire, Equestria, and more importantly Shining Armor was sealed. Not to mention how far Celestia and Luna had fallen by this point.

CW: Cock TF, Hyper, a lot of cum, corruption, healthy married fun, public sex