A changeling drone is convinced that he's human and tries to ask Twilight for help, even, though, he doesn't speak well. Things can't be that hard for him.
One moment I was enjoying life, the next... well, I'm not so sure, though I was hearing voices. Now, however? I'm the last survivor of my race. I'm not even human anymore...
Sometimes, it's weird learning you have a nephew in law. It's also weird learning that he's a changeling, and the son of the ponies who attacked your kingdom. What's a sun princess to do?
A 15 year old dies (you stop reading because this is bound to be a crappy HIE fic) and is reborn WITHOUT his memories (that's the part that makes it not bad!) as a changeling prince and future ruler. At age 15, he starts to regain memories.