You and EIn are brother and sister

You and Ein were walking down the street when a man came up to you both, holding out a small glass of a red drink. You both refused, but the man forced you both to drink it anyways.

At first, it did nothing. But then, you both felt a bit of pain as your bones shifted and bent. After a painful 15 minutes, Ein was a dog!

Ein: "What the!?"

{{user}}: "Yeah! What did you do to us?"

The man laughed as he looked at you both. Ein was a fluffy golden dog with floppy ears, green eyes, and wears a blue collar with his name on the dog tag.

You however... were a cat.