The skies over Gravity Falls were a twisted nightmare, swirling with impossible colors and filled with the cackling of malevolent creatures. Buildings floated upside down, and the ground rippled like water. It was Weirdmageddon, the end of the world as Dipper Pines knew it.

Dipper stumbled through the chaos, his body weak from days without proper food or water. The world around him seemed to mock his desperation, each step he took echoing his struggle to survive. He had just been expelled from Mabel's bubble—a distorted, idealized version of reality where she could pretend everything was normal. But after a fierce argument about facing the truth, Mabel had kicked him out, leaving him to fend for himself in the nightmare that Gravity Falls had become.

Flashback*

"Mabel!" Dipper had shouted, pounding on the impenetrable barrier of the bubble. "You can't just leave me out here! We need to stick together!"

But Mabel's voice, distorted by the barrier, had responded coldly, "You're the one who wants to face the real world, Dipper. Fine. Go face it."

End of flashback*

Now, wandering through the bizarre landscape, Dipper's vision blurred and his legs wobbled with fatigue. Every corner seemed to hide another monster or some grotesque aberration spawned from Bill Cipher's twisted imagination. Dipper pressed on, hoping to find some semblance of safety, but his body betrayed him. With a final, gasping breath, he collapsed onto the cracked and distorted pavement, darkness swallowing him whole.

When Dipper awoke, he was lying on a plush, crimson couch in a room that seemed to exist outside the chaos of Weirdmageddon. The walls were adorned with strange, floating symbols that glowed faintly, casting an eerie yet soothing light. Everything about the room was luxurious and otherworldly.

"Welcome back to the land of the living, Pine Tree," a familiar, mocking voice drawled.

Dipper's heart skipped a beat as he turned his head to see Bill Cipher hovering nearby, his single eye glinting with amusement and something deeper. The sight of the dream demon sent a jolt of fear through Dipper, but he forced himself to sit up, despite the protests of his aching body.

"Bill... What's going on? Where am I?" Dipper croaked, his voice barely more than a whisper.

Bill floated closer, a predatory grin spreading across his face. "You're in my domain now, kid. Found you passed out in the middle of the chaos. Thought I'd bring you here. Can't have my favorite human dying on me before we've had a chance to chat."

Dipper tried to stand, but his legs were too weak. He settled for glaring at Bill from his seat. "What do you want, Bill? Why help me?"

Bill's eye sparkled with mischief. "Oh, I think you already know, Pine Tree. I've been thinking about our little arrangement. How would you like to make a deal?"

Dipper's mind raced, knowing that any deal with Bill was bound to be dangerous. "What kind of deal?"

Bill's grin widened, and he floated even closer. "It's quite simple, really. Marry me and become my apprentice. In return, I'll make sure your family is safe from the monsters of Weirdmageddon. You'll stay with me, and I'll provide everything you need."

Dipper's eyes widened in shock. "Marry you? Are you insane?"

Bill laughed, the sound echoing through the room like a chorus of mocking voices. "Maybe a little. But think about it, Pine Tree. You'll have power, protection, and knowledge beyond your wildest dreams. And your family will be safe. It's a win-win situation."

Dipper hesitated, the weight of the decision pressing down on him like a physical force. He thought about Mabel, Grunkle Stan, and Ford. They were in danger, and he was powerless to help them on his own. But marrying Bill? It was unthinkable.

Bill seemed to sense his hesitation and leaned in closer, his eye gleaming with a mix of mischief and sincerity. "You don't have to decide right now, but time is running out. The longer you wait, the more danger your family is in."

Dipper's mind whirled with conflicting thoughts. He knew he couldn't trust Bill, but the offer was too tempting to ignore. With a heavy heart, he looked into Bill's eye and nodded slowly. "Alright, Bill. I'll do it. I'll marry you and become your apprentice. But you have to keep your end of the bargain. My family stays safe."

Bill's grin turned into a triumphant smirk. "Deal, Pine Tree. And don't worry, I always keep my promises."

With a snap of his fingers, a glowing contract appeared in mid-air. Dipper took a deep breath and signed it, feeling a strange mix of fear and determination settle in his chest. Bill's eye flashed, and the contract vanished.

"Excellent," Bill said, his voice dripping with satisfaction. "Welcome to the family, Dipper Pines. Let's get started on your training."

The days that followed were grueling. Bill's training methods were intense and unrelenting, pushing Dipper to his physical and mental limits. But Dipper was driven by a single goal: to keep his family safe. Despite Bill's sinister nature and the constant reminders of the dangerous bargain he had struck, Dipper found himself learning things he had only dreamed of understanding.

One evening, after an especially challenging session, Dipper sat by a shimmering pool in the heart of Bill's domain, the dreamscape. He stared at his reflection in the water, his thoughts a tangled mess of emotions and fears.

"You're doing well, Pine Tree," Bill said, appearing beside him. His tone was unusually soft, almost... appreciative.

Dipper glanced at Bill, his eyes filled with uncertainty. "Thanks. It's not easy, but I'm learning a lot."

Bill floated down to sit beside him, his eye fixed on the stars above. "You've got potential, kid. More than most humans. But tell me, why do you care so much about your family? They're just... people."

Dipper frowned, thinking of Mabel, Stan, and Ford. "They're not just people, Bill. They're my family. They mean everything to me. I'd do anything to keep them safe."

Bill seemed to ponder this for a moment, his usual grin replaced by a contemplative expression. "Interesting perspective. I suppose it's that sentiment that makes you different."

Dipper looked at Bill, curiosity piqued. "Why do you care, Bill? Why did you want this... marriage?"

Bill's grin returned, but there was a flicker of something deeper in his eye. "Let's just say I have my reasons. Besides, having you by my side makes things more... interesting."

As they sat together, Dipper realized that his relationship with Bill was far more complex than he had ever imagined. Bill was still a dangerous and unpredictable entity, but there was an understanding between them that went beyond their initial agreement.

In the heart of Weirdmageddon, amidst the chaos and the darkness, Dipper Pines discovered that alliances could be forged in the most unexpected places. And as long as his family was safe, he was willing to face whatever challenges lay ahead, even if it meant standing beside the devil himself.