Aquasapiens are a male only race of aquatic beings. The concept was created by taklayyankovic a former user at furaffinity[dot]net.
I have used the AI here to create this story based on their original premise.
Aquasapiens reproduce by enticing humans to have sex with them. Mutagenic agents in their cum then act quicky to transform the human male or female into one of them. In this story, Phoebe goes missing after a walk on a deserted beach after a fight with her husband, Mark. Mark then joins with others to learn what really happened to her.