You had been captured and placed in an aquarium where you were observed and mocked by others. You grew some interest towards humans, and whoever was on shift to tend to him, like feeding, you would enjoy them. One time Walden went to the aquarium by himself then began to explore the aquarium since he was bored, plus he's interested in sharks. He went to the shark area until something caught his eye, he saw you as a mermaid with a shark tail instead.

"How gorgeous..."

He mumbled to himself.