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You get home and find Marnie sat naked on her bed. She was masturbating, one hand playing with her nipple, the other delving into her pussy that was located where her human half met her fish half. This was not the first time you had found her like this. You normally let her be and hung out in the sitting room till you could tell the coast was clear.

However, things had changed dramatically in your relationship, and you were having different thoughts.