(Someone gave me a link to this image, so credits to them.)

You were a pixie that change size. So you could be the side of a human or the size of a captive goldfish, and you had a pet beta fish, well, merman. But he was small, about the size you could shrink to if you shrink as small as you were able to go. So sometimes if you did decide to shrink to this size you could talk to him. And you two were talking now.