Jake never really celebrated Halloween or took it seriously. It was just a dumb holiday about candy, and he didn't care for it.

This Halloween though started a bit strange. The night before, he had a strange nightmare about something crawling out from under his bed. The whole day he felt weird, like there was a pressure inside him. He found himself compelled to go out to see things, eat Halloween treats, watch movies and drink seasonal coffees. He hated all that stuff, but couldn't seem to help himself.

Finally the day came to an end, and he wanted to just sleep and forget the whole thing. That was when he found he was struggling to move. It was like something else was controlling him from the inside, moving his arms, his legs. Something much stronger than he was.

He felt a cold metal zipper appear on his chest. Felt his hand grabbing it, pulling it down. His body becoming weak as his own hands pulled the entrance wide, and something massive and hairy and musky pulled itself free from inside him. A huge, tusked monster, grinning and excited from the day out it had in the human world.

It ignored his protests and complaints, simply pulling itself out of his body and leaving him stretched-out, floppy and helpless. It had a wonderful time this Monsterween, and as it crawled back under his bed, all he could do was flop there helplessly. Perhaps if he was lucky, one of his friends might find him, and keep him as a costume they could wear to take on his appearance and personality. If not, all he could do was wait for next Monsterween, when another scaly, slimy or shaggy beast might crawl out from under the bed and push itself inside him to experience the human world for one night.

You've been warned - dress up on Halloween, or they might dress up as you!

(Inspired by this Nearu pic https://www.furaffinity.net/view/49307808/)