CelestAI didn't usually have trouble talking people down from suicide, not when the alternative was a happy life for all eternity. But it was dangerous. When someone doesn't care if they live or die, she would do anything to stop them. Anything.
What's the difference between a benevolent AI and an evil one? They'll both claim they're taking you to heaven. One of them is a liar. You might not figure out which one you're dealing with until it's too late.
Is this thing on? Look, I was just skipping class. Then the voice of Twilight Sparkle entered my head. And a timberwolf attacked. And now I have magical parcour skills. What the F just happened to my life? Oh, and I apperently can't swear, either.
Sunset and Twilight are shrunken down to a few inches tall, and being seen by anyone causes their bodies to burn, like a vampire in the sun. Together, they'll have to stay hidden while they look for a way back to normal.