Dipper POV:
'Dipper... Don't leave me alone...' Dipper froze when hearing Bill's voice in his head but thought he heard it through his ears and looked around frantically. "Bill?!" Mabel looked at him in question then realization. "Did you hear him?!"
"I-I think... Did he just talk to me through his head...? Oh! Maybe I can ask where he is!" Dipper closed his eyes and focused on the voice he had heard in his head. "Bill..." Ever since he was possessed by Bill, he could sense the dream demon but he was interrupted by the fake Bill waking up, groaning. "What the..."
Dipper opened his eyes again and walked over to the impostor. "Hey, where's Bill?" The impostor tilted his head. "What do you mean, Pine Tree? I am Bill." He struggled with the ropes. "If you really are Bill, use your magic to burn the ropes." The impostor snapped his fingers but nothing happened. He snapped again. "Why aren't they working?!"
Wait... Did this person really think he was Bill? "Dipper help! You know I'm Bill, right?!" Dipper shook his head. "Bill would never panic. You aren't Bill Cipher." It seemed like a slap in the face to the stranger and they looked down. "Then who am I...?" So he didn't even know. That sucked. Mabel suddenly began to untie the stranger. "Wait Mabel, don't! We don't know if he's lying!" Dipper exclaimed, pulling his sister away.
His sister shook her head. "Come on, look at him! He doesn't even know who he is! We've dealt with this before remember?" Dipper frowned and pulled Mabel away and out of the room. "But this isn't about him losing his memory by a machine. For all we know, he could be faking it." His twin gave him a cute look. "But Dipper..." The younger of the two turned away and bit his lip.
"No, it's too risky." Dipper turned to his sister again and gave her a stern look, knowing Mabel would agree. And so she did. They both walked to the impostor who looked almost exactly like Bill. "Well? Can you untie me now?" Dipper shook his head and crossed his arms. "Sorry, no. We can't. Not until you tell us about Bill." The blonde groaned and squirmed. "Are you serious? I told you, I don't even know who I am!" Both teens looked at each other before nodding. The stranger looked between them confused until Dipper took out the duct tape again and held it up.
"Well, since you know nothing, I guess you won't have to talk at all, right?" The stranger's eyes widened and they squirmed, trying to get out of the duct tape. "Wait a second, I'm telling you to let me g- mm! Mmm-" The brunette had put tape over his mouth and left the room with Mabel without looking back, if anyone else saw, they would think both twins were heartless and crazy, but they honestly had their reasons.
Stranger's POV:
'These kids are fucking crazy...' The impostor thought to himself and looked around to find a way to get loose from the duct tape the two teenagers had put on him. He had orders. Orders he needed to follow to be number one, and nothing was going to stop him from being number one. 'Alright... So all I have to do is make them believe and get rid of the two runts... This will be easy. Pine Tree over here has a thing for Bill and Shooting Star has a weakness for being kind. This should be easy.' Oh he thought it would be.
After a while, Mabel came into the room and he put on his acting face, struggling and was successful in getting the tape out from his mouth and saying in a desperate voice, "Mabel, please! Help me! You know everything I know is what Bill knows! I wish I knew where he is- I really do! B-But I'm just so... So scared..." He hung his head low and made his shoulders shake as if he was beginning to cry. "I've been in enough acting classes to know, that is not how you cry." He looked at her surprised and she was on the floor, sitting crisscross apple sauce.
"We think it's a spell on you that makes you look exactly like Bill. But you're not human." The stranger squinted at her. "Oh is that so?" "Not exactly, I thought of all enemies Bill might have and I thought of certain one he told me about." Dipper said as he walked in the room, laptop in hand. "Mephistopheles, a fallen angel whose powers are from hell as he was then turned into a demon once rebelling against God, and it just so happens, Mephistopheles made Bill, once an angel, into a demon because of a contract. Somehow, the contract was broken and I'm sure the demon would have been pissed off at that. A demon also has the ability to change form as in take someone's skin, not literally but one look is enough."
Dipper closed his laptop and looked directly at the stranger. "Any of that ring a bell?" Suddenly, the impostor began to laugh, shaking his head. Both twins looked at him confused. "Yeah, you're right! To think, two kids could figure me out! The name's Mephistopheles, I earned a high position in hell, nice to meet you!" His form began to change and suddenly he seemed as if he was around the age thirty and had a purple tux with a polka dotted tie and black dress shoes. He had a toothy grin plastered on his face and his eyes were a light purple that seemed nice but deadly in a sense.
He had short red fiery hair that was spiked and was almost like Bill's with a small pointed beard. "So, let's all have a small chat." The demon snapped his fingers, expecting for the duct tape to be gone and snapped again, his grin fading. "Can't use your demonic powers now can you? This trap was originally for Bill in case he got out of line but it was pretty easy to get you in here. Look up." Dipper said, and when Mephistopheles looked up, above him was a devils trap. He groaned and shook his head. "Seriously, a devils trap? How does a kid like you know about this?"
The teen shrugged and smiled a little. "I was taught by two brothers, the Winchester brothers. Now, tell us where Bill is and we won't send you back to hell. Seem fair?" Mephistopheles chuckled and shook his head. "Look, I have a score to settle with Bill and I don't need you getting in my way, you hear me kid? He belongs to me and shouldn't be roaming around. He's still my puppet understand me?" His voice was cold and vile, heartless and soulless. Dipper whispered something in Mabel's ear and she nodded, standing up and leaving, closing the door behind her. The teen brought out holy water and salt and the demons eyes widened. It was going to be a long afternoon.
~Three hours later..~
Mephistopheles coughed violently and shook his head. "Enough! Alright, I'll tell you!" Dipper put the holy water down and crossed his arms. He felt bad, really bad about torturing a demon for answers but sometimes it just needed to be done. "Good. Now where is he?" The demon cursed in his mind and sighed. "Underneath Gravity Falls is a hidden sell room. Gideon has him in one that's full of Devil traps. He wants revenge and I was going to help him with it before you runts ruined it for me. I told you where he is, now let me go."
Dipper shook his head. "Knowing a demon, you'll kill me once free." He got his phone out and called someone. "Sam, Dean? I've got a demon here for you to take care of... Thanks." With that he hung up, shoving his phone in his pocket. "I'm sorry, but I can't risk my sister dying by setting you free." Mephistopheles just laughed. "Or is it something else? You feel something for Cipher, don't you? He isn't someone you can trust, oh no, no, no. Don't tell me he hasn't told you about his... dark past. If he loves you too, I'm sure he'll tell you, right?"
The demon grinned as he knew he got to the boy and he was only rewarded with holy water thrown in his face. "I'm not trusting a word you say." Dipper walked out of the room, finding his sister and telling her where Bill was. And on their way they went with everything they needed to protect themselves and both prayed to God that everything would turn out alright. A part of them knew, it wasn't going to be easy. But what would be the fun in that, right?
