DISCLAIMER
Life With Derek belongs to Disney. Supernatural belongs to the WB. Creature is mine, though inspired by the Are You Afraid of the Dark? episode "Dead Man's Float" and the Water-Man legend, which I found on a folklore and myth site, though I made up some of the Water-Man's powers.
Later that night, Sam, Dean, and Casey sneaked into the pool room. Each had a small pistol full of rock salt in the back of their jeans.
"Geez. A pool looks different at night," Casey said. Dean powered up his EMF and Sam turned on the night vision on his camera.
"So, what are we looking for?" a voice asked. Startled, the three whirled around.
"Edwin! Marti!" Casey exclaimed.
"What are you two doing here?" Dean asked.
"We couldn't sleep," Marti answered.
"Why don't you two go back to bed?" Sam suggested.
"We won't be able to sleep. Mom, Dad, Lizzie, and Derek are snoring," Edwin complained.
"We can help," Marti stated. Casey sighed.
"Fine. Just stick close and don't do anything," she told them. They walked around. Marti wrinkled her nose.
"What's that smell?" she asked.
"Ozone," Casey answered. "I've never smelled it so strong before," she continued.
"We have---The Hookman," Dean responded. His EMF whirred.
"We got somethin," he stated. Just then, a light shined in the hall.
"Oh, great," Casey seethed.
"Sam and I will check it out. Casey, keep an eye on the other two," Dean said.
"'Kay," Casey acknowledged. Her older cousins walked out. To the chagrin, they found a night watchman.
"Hi," Dean greeted.
"What are you doing out here?" the guard asked.
"Uh, well---" Sam stalled. He wasn't as good at lying as his brother was.
"Our younger cousin thought there was someone out here. Her house got robbed right before we came here and it really shook her up. So when she said she thought she heard someone out here, we decided to humor here," Dean said smoothly.
"Really?" the guard asked.
"Yeah," Dean answered. Meanwhile, in the pool room, the smell had gotten stronger.
"Ew. It's getting worse," Marti complained. Just then, the water began to move towards them.
"Um...Casey?" Edwin asked, tugging on her shirt. Some of the water moved out of the pool and wrapped itself around Marti's leg. The girl shrieked and Casey tugged her stepsister out of the thing's grasp. Then, she placed her into Edwin's arms.
"Edwin, take Marti back to our hotel room as fast as you can, and don't look back," Casey said. Then, she yelped as the water grabbed her and pulled her under. With his own scream, Edwin took off.
"Edwin! Marti!" Dean exclaimed in surprise.
"Something's in the water!" Edwin shouted.
"What are you talking about?" the guard asked.
"Where's Casey?" Sam asked.
"In the pool. Something's got her," Marti replied. The three men looked towards the pool room just in time to see the door swing shut.