The clock is ticking. After being united in Canterlot's crystal mines, Twilight and Cadance, the real Cadance, must combat the threat of whatever infiltrated the alicorn's wedding, or risk losing not only Twilight's brother, but her friends, too. The solution will be difficult and the path fraught with danger, but with the power of love on their side, they can do anything. It will require a lot of love, though. Specifically, a love of bullets.
Another big thanks to EverfreePony for their editing prowess.
Image is a screen capture of A Canterlot Wedding -- The Manly Edition -- by PeteFlavey.