Bon Bon has revealed her deepest secret to her marefriend, Lyra.
She isn't actually a pony at all.
After some initial shock, Lyra decided that she is totally okay with this, much to Bon Bon's relief.
Later that night, Lyra, curious mare that she is, asks Bon Bon if she can get a closer look at her natural form. Of course, one thing leads to another...
Lyra x r63 (sort of) Bon Bon
This is a side story to A Novel Tale that takes place right after chapter 12. Reading A Novel Tale is not necessary for reading this, although it may help explain some things since I have a somewhat unique brand of changelings.
Novel Tale, a changeling living in Canterlot as a writer, has his peaceful life shattered when changelings from another hive attack, revealing the existence of changelings to all of ponykind. And his last book had a changeling character in it...
Lyra has discovered that her marefriend, Bon Bon, is actually a changeling! Fortunately for both of them, she's more curious than anything else...