Princess Cadence is a foalsitter who, being in rich, hoity-toity Canterlot, has to put up with spoiled brat after spoiled brat. Twilight Sparkle is a terrifying filly who drives away sitter after sitter. They were bound to find each other.
Twilight's been thinking about Pinkie Pie recently. She keeps control of it, afraid of how her friends might react. But circumstances conspire to bring Pinkie closer to her than she's comfortable with . . .
Discord, when he was still evil, always brewed over what nasty ways he could come up with to a hurt a pony's friendship. But now, only after he's become a friend himself, does he see that sometimes being a friend hurts the most of all . . .