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Here is what I am thinking, I would go for the one on the left. The top half so to speak. She is cute, has tiny perky boobies, and I am pretty sure, mermaid rules state that they turn into humans if out of water for too long.

If not, what the hell, fish are pretty slippery, I am sure I could be happy fucking a slippery fish, I already know I am used to the damn smell.