This story is a collaboration of me and DustyBunnie. I thought of making the chapter longer but decided this was a good start. It may just be a one-shot but it's a good one-shot.
BMO'S POV:
I heard Finn and Jake coming back from an adventure. I ran downstairs to meet them.
"Hey BMO!" Finn said.
"We got a surprise for you!" Jake said. Jake stretched himself in such a way that a box came out of him.
"Open it!" Finn yelled. I opened the box and peeked inside. It was a sweater!
"OOH!" I yelled.
"It's supposed to be magical, so it changes colors, we got it from PB." Finn said.
"And, it has holes, so you can still push buttons and stuff!" Jake yelled.
"Let's go play VIDEO GAMES!" I yelled. Finn and Jake were so cool.
"Sorry BMO, we can't." Finn said sadly.
"Aw, why not?" I asked.
"Because we're taking you on an ADVENTURE!" Jake yelled.
"YAY!" I yelled.
"Yeah, we got you the sweater to keep you warm in the ICE KINGDOM!" Finn yelled.
"Let's go!" I yelled. We ran outside and started going in the direction of the Ice Kingdom. Finn pulled out sweaters for him and Jake.
"Whoa, BMO, it's changing colors! It's yellow!" Finn said. I looked down and saw it, yep it was now a bright yellow.
"I think PB said it was like those old mood ring things, I guess yellow means your happy!" Jake said. We reached the Ice Kingdom.
"So, what adventure are we doing here?" I asked.
"Ice King kidnapped Truth-Telling Princess." Finn said.
"Does that mean she doesn't lie?" I asked. It didn't seem like the coolest Princess thing.
"No, it means she can make it so you can't tell a lie, at least for a few minutes." Finn said. I nodded, that was much cooler.