*Warning: This story has ponies in diapers being silly, and very few adult baby elements. If this displeases you, I implore you to take this with a grain of salt.
Spas are supposed to help a pony relax, yet the close Starling gets to the one in the pamphlet, the more stressed he feels. The printed words say his secret is safe, but for a pony who's never shared his deepest desire, no amount of papered reassurance will calm him. Fortunately, though, he finds more than a confident in Ponyville's newest spa; he finds a friend.