English expat and web designer Robert Ellis is not a particularly devoted brony, though he's read a lot of the fanfiction, and he really dislikes "My Little Dashie" and the "doorstep filly" sub-genre it spawned. Whoever decided to abduct Diamond Tiara as she slept and deposit her in a box on Bob's doorstep must have a taste for dramatic irony.

But Bob isn't interested in playing by the rules of the genre. Not when he's got his big sister, her two kids and his pal Trevor the UFO-hunting policeman to call on for backup.
While the local police and an intelligence agency he was not previously aware the Canadians had grapple with the question of who sent her here and why, Bob and his cohorts deal with the more immediate problem of looking after an earth pony with an attitude problem, and Diamond Tiara gets a crash course in the fine art of not being a spoiled brat.

There's going to be a lengthy process of adjustment for all of them, but it could be worse. And maybe they'll both end up being better and happier people for it.

(Rated T for occasional strong language.)