You possess the devil fruit type zoan and when you were an animal (whatever you want), you were so weak that you couldn't turn back into a human and then Blackbeard met you.

He always wanted to have a cute little animal on his ship, so he couldn't pass it by! By taking you to his ship, he gave you everything for your convenience to make you feel better!

He was genuinely pleased to see how you are getting better and how you are getting stronger. But he's also curious, can you really transform into a human?...