(I have been looking at a lot of Supernatural and Gravity Falls crossover fanart and it inspired me to write one.  Hope you guys like it and if you want me to write more like this let me know!)

"Gabriel you jerk!  Come out and show yourself!"  Dean yelled.  Gabriel had transported the boys into an alternate universe in the middle of a battle.  "Did you-Did you just call Gabriel a jerk?"  Sam asked his older brother.  "Did I?"  Dean whispered to himself.  "Well anyways, we have to find a way to get out of these dang woods and kill Gabriel once and for all."  Sam gave Dean another look.  "Great!  Send us in a universe where we can't even swear!"  Dean yelled storming off.

They walked for a good half an hour before they came across a small shack in the middle of no where.  They heard a girl shouting and some strange noises.  Both boys reached for their guns but alas, they had none.  "Waddles!  Come back here!"  The girl shouted.  The last thing Dean saw before he was trampled over was a giant pink blob.

"Dean!"  Sam yelled.  The pink thing was on top of him and he shoved it off.  It made a loud squeal.  "What the heck was that!?"  Dean shouted to no one.  "I'm so sorry!"  A girl said running up to them.  She had long brown hair and was wearing a colorful sweater along with a purple skirt.  And on her teeth were silver braces.  (Which I don't have anymore!  I have a retainer on my top and bottom teeth.  :/  It's better than the braces I guess.)

She picked up the now realized pig and held out her hand.  "Hi!  I'm Mabel!  Boy you two are cute!  And it just so happens that I'm single!"  She says loudly.  Both boys shook her hand and introduced themselves.  "You guys should meet my bro!  Hey!  Dipping Sauce!"  She yelled t'words the shack.  She pulled both Sam and Dean to the shack with the pig running ahead.

Inside the shack was just as run down as the outside.  Every item inside was overpriced and looked like a tourist trap.  Wherever...  This place was.  Mabel went into another room to find someone.  Meanwhile the boys looked around.

"This stuff isn't even real!"  Dean exclaimed.  "I mean..."  Dean walked over to a fish covered in fur.  "A 'Fur Trout'.  That doesn't even make any sense.  Or...  Or...  The 'Six Pack A Lope.'  What are these people even trying to pull here?"  Dean exclaimed in a hushed tone.  Sam just shrugged and tried to hide his amused smile.

Soon Mabel and a similar looking kid appeared next to her.  The pig was no where in sight.

"Sam, Dean, this is my twin brother Dipper."  The boys waved at each other and Dipper put his hands in his pockets because of the awkward silence.  Finally, Sam said something.  "So, where are we exactly?"  He asks the twins.  "This is Gravity Falls!"  Mabel says excitedly.  "And...  Where exactly IS Gravity Falls?"  Dean asks.  "Oregon."  Dipper says rocking back and forth on his heels.  "Great."  Dean mutters under his breath.

"Why don't you just call Cas?  I bet he could bring us back."  Sam says.  Dean just shrugs and adjusts the sleeves on his green plaid shirt.  He clears his throat and closes his eyes.  "Now I lay me down to sleep, I pray to Castiel to get his feathery butt down here."  When Dean finishes he opens his eyes to find two confused looking twins.

"Who are you guys exactly?"  Dipper asks.  "It's your turn.  I'll wait for Cas."  Dean says shoving his younger brother forward a bit before stepping outside.

"I'm Sam Winchester and that's my brother Dean.  We're not from here."  "Oh My Gosh You're Aliens!"  Mabel yells with bright eyes.  They can hear Dean snort from outside.  "No.  We're hunters.  We hunt supernatural beings."  "You too?"  Dipper asks and Dean pokes his head in.  "What do you mean, you too?"  Dean asks.

"We hunt monsters as well."  He says like it's no big deal.  Dean clears his throat again and steps in, kneeling down to the twin's height.  "Name three things you hunted."  Dean challenges.

"Well there was, "Rumble McSkirmish, Those Wax Figures, The Time Baby, Multi Bear, SummerWeen Trickster, Gobblewonker, Those Ghosts, a Pterodactyl, and Gnomes."  Dipper says counting off his fingers.  "I said three!"  Dean exclaims.  "Did you...  Did you just say Gnomes?"  Sam says with a confused look.  "Yes!  They were terrible!"  Mabel says stomping her foot.  "And what so so bad about them?"  Sam asks.

"They wanted me as their queen."  Mable mutters out.  Dean was trying to stop himself from laughing.  "Anything from Cas yet?"  Sam asks and Dean shakes his head.  "Well what kind of things do you guys hunt?"  Dipper asks.

"Ghosts, Leviathan, Reapers, Vampires, ya know.  Stuff like that."  Sam says.  "Vampires Are Real!?"  Mabel exclaims.  She screams with excitement and runs upstairs.  "She might be a while."  Dipper explains.  Not even a second later, Mabel runs downstairs with a different scream.

"Dipper!"  She yells jumping up and down.  "What?"  Dipper asks her.  "There's...  There's someone upstairs!"  Sam and Dean rush up the stairs without any more details knowing exactly who it is.  When they get to the top of the steps, a man in a trench coat stood looking at a family photo.

"Great to have you here Cas.  Can you get us out of here now?"  Dean asks.  "I would but it seems as though I need something before taking both of you home.  I am not strong enough to carry you both without it so I need one of you two to get it."  Castiel says.  "What do you need Cas?"  Sam asks.  "I need a certain dice block.  It is the infinity sided die.  It has infinity amounts of outcomes and if I roll just right...  Then I can get us all back to our dimension."  Castiel says looking at Dean.  "Anything."  Dean says kissing Cas on the lips slightly, then rushing down the stairs.

"Who is that guy?"  Dipper asks Dean.  "That is Castiel.  He is an angel.  And...  A...  Friend."  Dean stutters slightly.  "What Dean means to say is that Castiel is Dean's boyfriend."  Sam shouts from upstairs.  Dean's cheeks heat up and he rubs the back of his neck awkwardly.

"I, uh...  Don't suppose...  You guys know where I can...  Uh...  Find an infinite sided die?"  Dean full out rambles.  "Actually...  Yea.  Our great uncle Ford has one.  As long as we can have it back...  Than it should be ok."  Dipper says already running down the steps.

He soon returns with a small box and hands it to me.  "Cas!  I got it!"  Dean shouts up the stairs.  "Thanks Dipper, Mabel."  Dean says walking over and handing the box to Castiel.  Castiel picks up the die and shakes it up in his hand.  He releases it to the floor and some weird magical dust flies out and t'words Castiel.

"Now I am strong enough to carry you both home.  Gabriel was using this as a last resort.  I do not believe he meant to send you to another dimension.  Again."  Castiel says handing the die back to the twins.  He grabs Dean's hand and places two fingers on Sam's forehead.  "Bye guys.  Thanks again!"  Sam says before they disappear to their own dimension.

"We might have to go back and visit sometime."  Dean says