sorry for my lateness, I only have half done, but its good.
Fionna smiled as Marshall set her down in his castle, "I feel kinda bad for leaving everyone."
Marshall chuckled, "they'll be fine."
she looked around, "looks darker than last time I was here.
Marshall laughed, "it always gets this way at night.
he flies around her, smiling a he circles closer and closer to her, taking her in, savoring the way she looked, for that would soon change.
"my sister, as you know, has gone full good guy, so..." he floated closer and curled around her like a snake, he liked her lobe as he whispered into her ear, "the vampires are in need of a new queen..."
The whisper, combined with the lick, sent shivers down Fiona's spine, she felt her panties flood again as she realized what he was saying, "hhhh.."
he smiled, Marceline had removed the brainwashing effects of his bite, but she was still his to command and take at will.
"so...wanna be a vampire?" He asked, slipping a hand under her dress to plunge into her panties, the other massaging her left breast.
Fionna whimpered, she felt three fingers plunge into her sopping pussy as a thumb entered her ass, "y-yes...oh glob yes..." she arched her back and kissed him, he had her, body and soul.
suddenly his teeth grew and they plunged into her neck, she moaned as she felt the vampire's venom snake into her veins, and like that, everything went black.
Fionna woke in a bed, she looked around, Marshall wasn't there, she got up and looked around for him, "Marshall?"
suddenly she stopped and turned, there in a mirror was nothing, she couldn't see herself.
"OH GLOB!"
