An Oasis in the Blizzard

Twilight is alone in her library, a storm is thundering outside. No Spike who is away on holiday. When she recieves a knock on her door.

Twilight Sparkle is alone for the night. Her invaluable assistant Spike is away for the week helping the princesses in Canterlot. She has settled down for some reading but hears a knock at her door.

Who could it be?