So, I was thinking.... Since I already ship MABill (Mabel and Bill), I'm planning to make an AU about it AU (Alternate Universe) <3
I'm gonna do the plot first... I'm still writing the story on a notebook... XD
"When Dipper found the Journal #3 at the forest, he brought it back to the shack to show it to his twin sister Mabel. Mabel at that time was in her boy crazy stage when Dipper arrived. They both went to the attic and flip through some pages of the journal. Because of curiosity, Dipper accidentally pronounced a sentence which summons a human-like demon of pure energy. He introduce himself as Bill Cipher. But this time, Bill is not what you think he is. In this AU, Bill lost his memories of being evil. Afterwards, he started to hang out more with the twins. Bill is still weird, crazy and always curious. As the story progress and also the many adventures that the three developed, he can't even stay in one place without checking or following the twins everywhere they go. (It's like the line that he always says... 'I'll be watching you' XD). He starts to develop special feelings for Mabel. And he is like a bro for Dipper. Bill always protect the twins from danger when they go mystery hunting and searching for the author of the book. His amnesia though is still a mystery.
I don't know if those are the right grammars to say but..... c'est la vie!!...