Fics like Triphane Finds Treasure

Triphane finds himself lost, soaked through with rain, and no closer to the treasure he seeks - until he spies a cave. “Sorry, I got a little turned around. Some guy sold me a map that was a total bust—” He blinks when the man then crawls a little closer, his long and glossy black hair shimmering in the light of the fire. Something seems…off, but Triphane can’t quite put his finger on it. Until the man gets even closer and he realises the ceiling of the cave isn’t as low as first he thought - the man is just twice his size..! And below those perfectly carved pecs and abs, much like a mermaid, one thick tail rests instead where two legs should be. Before he can back away, something from behind grasps him about the ankle, dragging him closer; and then Triphane is hanging upside down, face to face with a— “Naga..!”