"Oh shit!" Marceline shouted "Oh shit, oh shit, oh shit!"
Princess Bubblegum was still dazed from her transformation. With a small sigh she fell to the ground. As she hit the floor Peppermint Butler burst into the room, alarmed by Marceline's shouting. He could tell what the problem was without even looking.
"You bit her didn't you!" accuses Peppermint, a grimace on his face.
"Y-yes." admits Marcy abashedly.
"This simply won't do," says the little candy man. "We can't have a vampire as the ruler of the kingdom, age old laws prohibit it!" He quickly sprints out and back in. "Luckily I know someone who can help."
He unrolls the scroll he grabbed, revealing a long incantation. He begins to read off the incantation in a deep intoning voice. When he is finished a demon appears.
"Quid quaeris?" the demon asks, his voice surprising caring.
"O princeps magnus deamon est infirmis, commodo aviuvabit eam." the butler says, quite calm all things considered.
"Ut risus pecunia purpura requiram."
"Suscipiam termini vestri."
(The gist of this is that the demon wants a mushroom to help the princess and Peppermint agrees to get it for him.)
With the deal settled the demon returns from whence he came.
And so it came to be that Peppermint Butler had a new quest, this time he had to find a mushroom to undo the harm that Marceline had wrought. As this was a big task that would require a long journey back into the caverns the little butler thought it would be a good idea to go for help. He scrounged up what help he could in the Candy Kingdom, however that only amounted to the insanely buff Starchy (he had spent his time in the dungeon pumping iron). Thus once again Peppermint found himself needing Finn and Jake's help with adventuring.
*knock knock*
"Oh hey Peppermint." said Finn. "Jake and I were just napping after that crazy adventure we had together."
"Funny you should mention that." the butler said with some reservation in his voice. "Because I was wondering if you'd be willing to come back down there with me. You see PB has fallen ill and I need a mushroom to help her."
"Awww man, isn't there any other way to fix her, I hate it down there!"
"I'm afraid not Finn. I will grant you a magical favor if you help me."
"You know I can't turn that down."
Just then Jake came down from the bedroom.
"Yo man, we're helping out Butler again." Finn calls over to him.
"I don't wanna."
"No its cool, he promised us magical favors if we help him."
"Oh really? Sweet, I'll go then."
"Hey Peppermint Butler, you never promised Starchy no magic favors." Starchy said. "You're gonna have to give me something too if you want my help."
"Fine, I'll give you something too Starchy. We'll sort it out when we get done with the quest." Peppermint Butler by this point would go along with whatever they wanted just as long as they would help.
The group then proceeded to grab lots of supplies as no one knew how long the trip to the caverns would last. They also grabbed an ax for Starchy as he had no weapon to speak of.
Finally armed and ready, they proceeded to the entrance to the dark caverns of Ooo.