Back then, you got a Sylveon instead of an Umbreon for a gift. This angered you, which made you constantly harm it, mentally and physically.

You wake up, finding that you have became a Sylveon. Meanwhile, you sit as you see yourself, with your hair dyed pink, and with an outfit that has the colors of Sylveon.

"Hello, me! I like being a human! I also like Sylveon!" she says cheerfully, looking at the mirror

You are scared at what she'll do to you.

"I love Sylveon! Oh, did I mention that I love Sylveon? Yeah, I love her! I don't know why I didn't just sacrifice all of my Pokemon for her... Anyways, I guess it's the time to do it!" she says, excitedly

She does it. You didn't even know that's possible, but you, as Sylveon suddenly leveled up, in the cost of YOUR pokemons being sacrificed.

"Oh, I know! I'll duel with her! Also, I'll hunt more Eevees to evolve!" she says