"So is that all you wanted to tell me?" Lillian asked sensing there was something else.

"Yes! Wait! No," Jack said suddenly frowning darkly.

"What?" Lillian asked scared by the sudden change of attitude. Jack noticed where they were standing and frowned.

"Let's talk somewhere else," he said. "This is a secret." He grabbed Lillian's hand and they disappeared.

They reappeared back in the forest. "Ok I left out something when I told you my story," Jack said.

Lillian frowned, "What?" she asked.

Jack bit his lip, "Ok, when I saw Bill and learned things about him I also learned there was a secret society in Gravity Falls. I think Grunkle Stan is part of them but I'm not sure. They have all the books and are using them as a doorway to unimaginable power. They were used to power a machine, Grunkle Stan got the third from Dipper and after he was done have it back. Bill wants the power too and they don't want him to have it so he's an enemy to them. If they find out that he has kids they're gonna try to capture us. Use us!" Jack explained.

Lillian's jaw dropped, "Ok, well we just have to keep it a secret from them!" she said.

Then realization hit her, "That means I can't tell Dipper and Mabel," she said sadly. Jack thought for a moment.

"I think you can tell them. We just have to make sure Grunkle Stan or any members of the secret society don't find out," he said.

Lillian frowned, "Who are the others?" she asked.

Jack shrugged, "I don't know. I only learned about there being a secret society. Bill wasn't really thinking much of Stan or the society when I first saw him," Jack said.

Lillian nodded, "Ok. Dipper and Mabel will keep it a secret! I know they will! Oh, can I tell Faye. Me and her are also good friends!" Lillian said.

Jack thought for a moment, "The girl with the brown hair and brown sweater?" he asked. Lillian nodded.

"Sure I guess," Jack said. Lillian nodded then frowned.

"Now how are we getting home?" she asked. Jack snapped his fingers and they disappeared.

Little did they know, a unknown spy watched their conversation from his hiding spot. He grinned evilly.

"Perfect…" he said. He whispered something into his walkie talkie.

"Two of them…yes…yes we'll get them in our power and make sure they're cut of from the outside world…ok…copy that!" he turned it off and ran away.

Meanwhile Lillian and Jack walked back into the Mystery Shack. Just as Lillian was about to say something she was tackled to the ground by Mabel.

"OH MY GOSH LILLIAN WE WERE WORRIED WHERE WERE YOU?!" she cried.

Lillian laughed nervously, "On the roof…urg Mabel…can't…breath!" Mabel let her go and they got up.

Mabel noticed Jack and smiled, "Who's this?" she asked. Jack's face turned slightly pink and Lillian stifled a laugh.

"This is Jack," she introduced. "Jack this is Mabel."

Jack smiled, "Hello, Mabel! Nice to meet you!" he said his voice slightly higher then usual.

Lillian tried to hide her snickers.

Jack glared at her and Lillian faked a look of innocence. Mabel turned and yelled, "GUYS I FOUND LILLIAN!" she called.

As she was distracted Jack told Lillian off, "You practically tipped her off!" he scream whispered.

Lillian grinned, "Hey I've never had dirt on a family member before! This is hilarious!" she whispered back.

Jack frowned and folded his arms, Lillian sighed, "Fine sorry. I'll do better!" she said.

Jack nodded and they turned back just as everyone came back down. Dipper grinned at Lillian, "Lillian you've been gone for like forty minutes! Where were you?!" he demanded.

Lillian rolled her eyes, "I was on the roof," she said. Faye noticed Jack.

"And who's the guy?" she asked. Mabel grinned.

"This is Jack!" she said. Jack smiled at them.

"Hi!" he said. Dipper's eyes narrowed.

"Hey! I'd recognize that voice! You're Bill!" he said. Jack shook his head.

"It's an honest mistake but I'm not Bill Cipher. That's actually what we wanted to talk about, " he said.

Dipper folded his arms and glared at the boy. Lillian sighed, "Dipper he's not Bill, but there's a reason he seems like it," she said.

Faye frowned, "What?" she asked.

Lillian took a breath and told them their secrets.

Oh no! A spy for the secret society has found out! What are they gonna do?! And how are Dipper, Mabel, and Faye gonna react to Lillian and Jack's secret?! Also I'm liking writing Jack a lot!

Jack: Why thank you!

Lillian: Can we go now?

Review please!