Dark Mermaid vs Mermaid (Patreon)

The Dark Mermaid is a mermaid that's been corrupted by a specific breed of mind altering starfish that attaches itself to the sweet nectarish nipples of the mermaid. These starfish exist in pairs and share a mind that controls the host. This symbiosis sees the mermaid go thru a physical transformation which includes stressed, whitened hair and their tentacle loses engulfing/sterilizing abilities, becoming only penetrative. They develop a craving for frightening prey which is demonstrated by their feeding heavily on cephalopod ink which taints their coloration.