The story takes place in a land of mythological creatures.

Keith is a lava merman who lives in a volcano. Everything he touches burns instantly. He can only swim wherever lava flows.

Near by the volcano is a sea, which is where Lance lives. Lance is a merman as well.

Keith regularly swims to the edge of the volcano to look at the scenery around him. He always admired nature. The trees, the plants, the flowers, the water. And how after it rained a rainbow would form in the sky. Although the rain hurt him and he'd have to go back under the lava to take cover.

One day Keith swims to the edge of the volcano and looks down at the sea. There he see's a merman sitting on a rock. He is instantly captivated by the boy. With his shiny blue scales that shimmered in the light. His translucent fins. His sunkissed skin and how the beads of water rolled down. And how it looked like he was practically glowing in the light.

Everyday Keith swims back to the same spot just to watch the merman of the sea. And he gets disappointed on the days he doesn't  show.

Lance was a merman who lived at the bottom of the sea with his large family. He often spent his days hanging out with his friend Hunk who was a merman with a golden yellow tail.

He isn't allowed to swim to the surface because it's dangerous. But he does it anyways because he's so fascinated by the land.

One day the lava starts to flow from the volcano and Keith is able to swim down from the volcano. He gets a closer look at the ocean.

On that fateful day he meets Lance. Who is also very interested in Keith. The boys skin was dark and looked almost like stone. His skin at a few cracks in it, which it looked like hot magma flowed between the cracks. And his hair was fiery red, and his eyes glowed yellow.

Keith is also entranced by Kance and he decides that Kance definitely looks better up close.
Keith and Lance begin to spend everyday together. Eventually they begin to fall for each other.
The only thing is that they can never touch. If Keith touches Lance he will burn, and if the water touches Keith it'll hurt him aswell.

Keith can't follow Lance into the ocean and Lance definitely can't follow Keith into his volcano.

They're so in love with each other but they can never be together.

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So y'all know how the rules work. As stated in the description of this book, if you want to use this plot idea for your own fanfic you need to ask.
You also need to give me credit for the idea.

And tell me when you post the story so I can read it.
Also, if enough people in the comments want it, I'll try and write a fic with this plot :)