What comes between a girl and her dragon? If she's Princess Luna, absolutely nothing!
Of course, it's not that Luna's really all that crazy about Varga... after all, what can you do with a 200 ft. tall dinosaur with a really lethal case of bad breath?
No, Luna's attachment is much more personal; you see, when Luna's castle was being attacked by an invading army, she accidentally sort of invoked the ancient spell that summoned Varga, only to find herself stuck on the monster's forehead... permanently.
This is great for repeling invaders, but it just ruins your chances for a good marriage, especially since the part of Luna that's stuck to Varga is a portion of her anatomy that's extremely indelicate to discuss in polite society.
This is one case where having all your troubles behind you is NOT such a good thing, but at least poor Luna's luck hasn't completely bottomed out: on the rare occasions when there isn't an invading army at the palace gates, Varga can shrink himself down to a vestigal tail that only ruins the cut of Luna's cute little battledress.
Still, between an army of invading demons, a giant sea serpent, a mad magician, a gluttonous general, an extremely ill-behaved barbarian berzerkers, and a whole slew of shape-shanging soldiers, sorcerors and sidekicks, neither Luna nor Varga will have a moment to themselves for a long, long time.