So, I was watching Teen Titans today and the episode 'Beast Within' where Beast Boy (in case you didn't know, just imagine a green Leo that has Frank powers :P) goes berserk gave me an idea.

This story takes place after BoO. It's not set in my usual Leo-disappears-for-years-universe. This is basically a while after Leo takes Calypso back to camp. Doesn't matter how long he was gone, or how they got to camp after Leo rescued Calypso, just know they're at camp now.

Also, let's say Calypso is mortal. Use your imagination on how that happened, because it's not important to this story.

I own nothing you recognize as canon. As said before, inspiration behind this story goes to Teen Titans season 3/episode 9/ The Beast Within.

~THE IMP WITHIN~

Ambush

"Watch out!"

Jason Grace dodged the empousa attack with millimeters to spare. Her claws raked against the alley wall, cutting deep.

Jason stabbed her through with his sword and she disintegrated.

"Thanks," he shouted, though it was cut short. Another empousa took her place and sparred with him.

A few feet away, Piper McLean (aka his girlfriend) was going toe-to-toe with a couple of her own emposai. She was doing really well with Katropis, dodging and stabbing like she had rehearsed this with the vampires.

At the end of the alley was an inferno—more commonly known as Leo Valdez. He had the most emposai surrounding him, though he was holding them back easily enough. Even though they had fire for hair, they seemed to shy away from Leo when he burst into flames. He laughed as he smashed their faces with hammers.

Jason could hear him shout, "HA! Take that! Sorry, ladies, this guy's taken!"

Jason rolled his eyes and struck at the next empousa. They had been ambushed, of course, on their way back from Camp Jupiter. It was a kind of friendship adventure—they had all three gone to the Roman camp to oversee some shrine repairs (though Leo didn't like leaving his girlfriend Calypso). It was technically Jason's job, but Piper had insisted they all go together, just like old times.

On their return journey, they had gotten a call from CHB. There had been a distress call for a half-blood rescue in downtown New York. They had found her, a young girl by the name of Kelly. She was lying unconscious near Leo, knocked out by one of the empousa near the beginning of the battle.

Jason dodged another attack, pleased to see Piper once again by his side. Neither of them heralded serious injuries—a scratch or two, nothing bad—so that was good.

Suddenly, Leo yelped. His fire sputtered out and Jason saw him and Kelly's body disappear under a mound of shrieking emposai. Jason and Piper slashed like crazy at each of the vampires.

Leo screamed under the mass. It was a heart-stopping kind of scream that made the son of Jupiter shiver slightly. Jason slashed another empousa before finally seeing Leo. The son of Hephaestus was on the ground, lying on his side. His neck was swollen and bloody, and he was unconscious.

Piper wailed and struck like lightning at the remaining emposai. Jason grabbed Leo and dragged him to safety. He started applying pressure to Leo's neck, causing the son of Hephaestus to groan.

Piper was suddenly next to him. Jason glanced down the alley and realized Piper had killed all of the monsters in the alley.

My girlfriend rocks, he noted as she fed some ambrosia to Leo. The Latino sputtered and coughed. The holes in his neck closed, but the swelling got worse. Red patches surrounded the lumps and worked their way up his face.

Leo opened his eyes. They were cloudy. "Ow…" he groaned before falling unconscious again.

Jason sighed. "We need to get him to camp. Will Solace will know what to do," he said, gently maneuvering Leo onto his back. "You take Kelly. I've got Leo."

A/N: Short, and fast, I know. I can't do action as well as I do fluff, so sue me. You can probably guess what might happen if you pay attention to the title and inspiration. Spoiler alert, the story will kinda follow the inspiration's plot for a bit, but ends up a little differently after a certain point.

And I don't know how many chapters will be in this. Should be fun :3