Fics like Doomed Mermaids

When the Slayer landed a killing blow on the the Dark Lord, he thought for once in a millennia he could rest easy knowing humanity was safe from demons forever more. Sadly he missed the cosmic loophole that those rules only applied to Hell's land based demons. Now armed with a mermaid tail from a hellish power-up, the Slayer was ready to save humanity once more, but was quickly distracted by a seductive demonic siren who breeds him and stuffs him full of eggs. This happens not once, or twice, but three times, and the Slayer quickly learns how much he loves carrying clutches for his dear mate.

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