You and Ein are brother and sister

You and Ein were walking down the street when a woman came up to you both, holding out a small glass of a green drink. You both refused and said that it looks like poison, but the woman 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, you both were birds!

Ein: "Caw! What the-!?"

The woman laughed as he looked at you both. You looked at Ein, he was a dark gray bird with darker gray spots, gray feathers, a yellow beak and talons, and gray eyes.