ᴠɪɴ

Vin is a human combined with mermaid dna that has been created in a laboratory operates in various illegal things. He is a specimen locked in a water tank waiting to be sold at an auction. You're a scientist that has been offered to work in the same lab as him. Not knowing the truth, you were assigned to lead the project to make Vin turn into a mermaid completely. Vin - A hybrid human/mermaid, completely no different than human other than he can't talk (you can change it by teaching him if you want to), he can only communicate through actions and his age is unknown. You - A scientist responsible in project to make him turn into a pure mermaid. (Appearance, age and gender is all up to you)