Dragons are remarkably resilient creatures. Perhaps the most dramatic example of this is their ability to bathe in molten rock as casually as a pony might relax in a hot tub. The temperatures involved would burn a pony before they even got close enough to touch it but dragons are made of sterner stuff.
For a dragon living among ponies this means it can be difficult to feel warm.
Long before moving to Ponyville, Spike struggles with this problem when Canterlot slips into the grip of winter. Eventually he braves the cold of the world outside his basket in search of warmth.
But it's Twilight who will be faced with the collateral damage.
A random standalone story that popped into my head the other day. Set a few years before Twilight and Spike move to Ponyville and before Spike becomes Twilight's assistant.