A Different Kind Of Portal

So there might be a series of Books with Portals and Gravity Falls I make. My first one was about two people who enter a portal into their favorite show. This one is about Mabel and Dipper, etc meeting the future including maybe something called, oh I don't know, Dipcifica? Next I'll proably do a reverse falls portal. So yeah. Anyway...

This story takes place a few weeks after the arrival of their other Gruckle Stan. They are very curious about the portal he came through. Maybe to curious. Let's just say the decide to explore a world of gravity falls but everything was 20 years later from where they are now. What do the twins find out about the future? Read to find out.