Finn was extremely bored right now. Jake had gone out on a date with Lady Rainicorn and BMO was currently charging. This left him all alone, with nothing to do. He couldn't exactly go on adventure without Jake, so he decided to do something else. He would go visit Marceline.
After a long walk, he arrived at the cave where Marceline's house was located. He approached the door and knocked, hoping she was home. After several seconds, the door opened up to reveal Marceline. However, this wasn't the way she usually looked. Now she was massive, he guessed around 400 pounds of jiggling fat.
"Marceline, is that you," Fin asked. "Why are you so big, did something happen?"
Marceline gave him a look like she was confused.
"What are you talking about Finn, I've always looked like this," she said. "Why don't you come inside for awhile."
Finn didn't understand. She hadn't always been fat like this. He tried to make up an excuse to leave, but she wouldn't listen. She grabbed him and pulled him inside her house, locking the door behind them. She told him to sit down, so he did, while she continued to hover around. Her hovering didn't seem to be affected by her weight.
"So, what brings yo hear Finn," she asked.
"Well, Jake and BMO are both busy, so I was wondering if you wanted to hang out. Maybe we could go on an adventure," Finn said.
Instantly, the look on Marceline's face turned to one of anger.
She floated over and got right in Finn's face. She was so close he could smell her awful breath.
"You know I don't like you going on adventures," Marceline snarled. "It's stupid and a waste of time. Time you could be spending serving me."
"What the lump are you talking about," Finn asked. "You know I love adventuring. Besides, why would I serve you?"
"Because, I'm bigger, stronger, and better than you in every way," she said. "Now, let me prove it."
With that said, she picked Finn up and belched loudly in his face. He barely had the time to smell the awful belch, before he was slammed onto the floor. As soon as he hit the floor, she dropped feet-first on his stomach. Immediately, all his air was knocked out. She stepped around on him a bit, before changing up her tactics.
Marceline started floating her massive body upwards, until she was at the ceiling. Once she was up there, she smiled down at Finn, then dropped. Finn didn't have a chance to move. Her massive ass landed on top of his head, swallowing it into her crack. She wiggled around a bit, then let out a thunderous fart. Unfortunately for Finn, he was directly under her hole, and took the full brunt of the fart. It was by far the worst thing he had smelled in his life. No matter how hard he struggled, he couldn't budge Marceline's massive ass. The lack of air, intense pressure, and noxious fart eventually became too much. He passed out under her huge body.