Dipper sat on his bed, staring down at the floor. Everything that happened this summer, it felt so surreal it was as if he had imagined it all. He would've loved it if everything was just a delusion of his. But it wasn't – everything was real.
Dipper let himself fall on the bed. He wondered if he could go back to being the same kid he was when he came to Gravity Falls in the first place, if he could take back all his adventures. Dipper's eyes traveled on the bed across his room. He expected Mabel to be there, knitting one of her sweaters or doing something she'd call "fun". She wasn't, of course. Mabel was dead.
His twin sister was gone, forever.
Dipper's eyes welled up with tears. He couldn't help but mourn over his sister. It had been a week since she died, since they've defeated that monstrous demon who called himself Bill Cipher.
Dipper bit his lip.
He wiped his tears off and stood up. He sneaked downstairs, making sure nobody noticed him. The shack was oddly empty. He wasn't surprised, everyone was helping out in town, cleaning the mess Bill made. Dipper entered the code to the vending machine and entered his Great Uncle Ford's quarters. Little did he know that there was a lurking darkness waiting for him in Ford's lab. Either way, Dipper wound't really care. He lost everything he cared for anyway.
He stepped out of the elevator and rummaged through the things in the lab, looking for one specific gun. One. Specific. Gun.
One that could erase all his memories of summer.
After pulling out a lot of junk from the cabinets, he found it. He was more than welcome to erase his entire summer from his memories. He was going to erase it all; the gnomes, the journals, his adventures, Bill...
... Even Mabel.
He put the gun to his head and took a deep breath. It was a good run, he had to admit, but it didn't turn out right. Nothing turned out right.
Goodbye Mabel.