As Moondancer goes through the forbidden section of Canterlot's library, she discovers a book that seems very out of place, promising great happiness to those smart enough. She ends up learning what it truly means to be happy...

The following story contains brain drain, breast, butt, and hip expansions, ego-inflating, and a very derpy and dumb mare being very derpy dumb and horny.

All Characters are 18+, obvs.