What happening when Aru get a really stupid idea? This.....So I made an AU (don't know how much it count as an AU).
Ford made a machine which can change ages, after that the prototipe was powered up when Stan and Ford get in a fight (like always) and it shot at them. That's when they get changed back at their child self again.
After weirdmageddon Bill get in nowhere where he met his twin Will, and with Will's power they went back to Gravity Falls and they got a human form to live almost like normal humans...almost.
Mabel and Dipper went home, but after a phone call (Stan called) they was sent back to the Mystery Shack in Gravity Falls where they registrated in to the school.
What's happening in here?
The Stan twins are fighting a lot after their age change. The Pine twins are try to help their grunkles as they can. Will try teaching Bill how to be more like a human than an evil demon (of course it's hard for him).
Why don't I call them both Pine twins?
Because I don't want to call them Pine twins seniors and Pine Twins juniors. If I call them Pine and Stan twins everybody going to know which pair is which one.
So in short that's all
Hope someone gonna like it
I finished it