Douglas came through the mirror portal to Equestria from a war-torn world, beaten and left for dead. Taking sympathy on him, Celestia allows him to live and work in Equestria. Douglas settles into his new life easily, but he receives a chilly reception both from his coworkers and the residents of Canterlot, despite his favor with the alicorn sisters.

In a bid to increase funding for the Crystal Empire, Celestia and Luna offer Douglas a transfer opportunity to the crystal city. Eager to escape, Douglas accepts the offer and comes into the care of Prince D'Amore Temporus and his Captain of the Guard, Gleaming Shield. But something appears off about the prince of the Crystal Empire, especially when he starts taking an interest in Douglas.

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Prince D'Amore Temporus/Tempo = r63 Princess Mi Amore Cadenza/Cadence
Gleaming Shield = r63 Shining Armor
They're not married here.