Twilight reads about a way to view a pony's soul, to see everything about them laid bare. When she tries it on her friends, will she be able to look at them the same way again? Or will the secrets hidden in their hearts drive her away?
(Yes, I borrowed the idea of a "soulgaze" from The Dresden Files, because it's something that really fascinates me. It's not a crossover, just an idea.)
Now has a sequel!