Dipper and Mabel went outside. Mabel watched Dipper run around the shack, like 50 times. He had a lot more energy than before.

Mabel remembered something, her hamster ball.

"I'll be right back." She told Dipper.

It was half an hour when she returned in her hamster ball that was filled with water. There were openable holes so she could let more air in.

"Mabel, is that safe?" Dipper asked.

"Pfffft, yeah." She replied.

Boom

She was aggressively head-butted over a few meters back.

"Hey!" She half-yelled as she rolled back.

Dipper was prancing around her, wagging his tail.

"What are you doing?" She asked.

"I wanna play." Dipper answered as he head-butted Mabel's hamster ball. "Tag." He said as he pranced to the other side of the yard.

Mabel rolled to him, laughing. After she finally knocked him a bit with her hamster ball, he'd head-butt it.

--------------

Stan was in his lab, looking in the journals for things connecting Bill and monsters with no luck.

He did find a page that told of a stream of water that changes the physical and mental shape of a person into a monster's. That didn't help though. He hadn't been near any streams. Something had to have spread it around town.

Or someone. Mabel and Dipper were out in the forest the day before everyone turned to monsters! They must've been in the stream.

Stan looked for a cure. There was none. He took a deep breath. Their parents would have to be told what happened.

---------------

The next day, Dipper and Mabel were grounded. Dipper ran around the room nonstop as Mabel swam in her pool.

They heard a vehicle park near the shack.

They looked outside. Their parents had come! But why?

They heard screaming when they heard the door to the shack open.

Dipper started panicking and pacing.

"What should we do Mabel?" He asked

"Wait for them to come see us." Mabel answered.

They heard knocking on the door. Dipper shoved his head under the bed, trying to hide. His deer side stuck out though.

"My babies!" Their mother shrieked as she went up to Mabel.

"What happened?" the dad asked frantically as he pulled Dipper from out of the bed.

"Oh are you okay?" The mom asked.

"Uh, yeah we- we're fine." Dipper said as he backed away from his dad.

"And we don't know what happened." Mabel answered.

"I think I do." Stan said

Mabel and Dipper looked at each other.

"I found this in your journal after Wendy gave it to me." Stan continued, showing a page about a cursed stream. "You guys must've walked in it and gotten some of that water on you."

"1. That day we didn't even go in any streams. All we did was pick this flower." Dipper said as he pointed to the orange lily.

"2. It's infectious?" Mabel continued.

"Only if you have that water on you." Stan said.

The Twins' Parents were taking all this in. "We'll just leave you guys talking about this..." Dad said.

The mom whispered in dad's ear. "Let them talk." He said.

"So you weren't near any streams." Stan said.

"No" Mabel said.

Dipper was thinking.

"Dipper?" Mabel asked.

"Dipper?" Stan asked angrily.

Dipper shook his head and looked back and forth at them. "What?"

"Were you by a stream?" Stan asked.

"I guess those flowers grew pretty close to a stream..." Dipper replied

"The flowers... plural?" Stan asked.