FiBlue:
I'd say to post it.
The realistic ones are great, but sometimes pure flights of fantasy are needed too. There are plenty of other outlandish stories around already, so it would be in good company (assuming it is not too far out to be accepted by our illustrious head librarian, naturally).
Our illustrious head librarian has written plenty of whacky, outlandishly absurd stories of her own - Cheese monsters, Bunyon Bottom etc Heck, I even have an ebook called Spanked with a Sausage!
Who cares if the story isn't plausible or if it's funny and ridiculous. Part of the enjoyment of writing is to use your imagination and just go for it.
So providing the story is ultimately a spanking story and meets the guidelines set out in the author guide, go for it!