Riding His Midnight Train.

https://www.amazon.com/dp/B086RQD41L

Deep in the woods there is an old forgotten town. Nobody lives there anymore. Nobody rides the train that once upon a time came through the town to deliver its passengers. The government put a stop to that after the train wreck in the 40s. Truth is, the train that visits the town, and still does on nightly occasions, does not have your regular comers and goers. The passengers of this train come from a mysterious place; a place of debauchery, sin and lust. They had transformed into monsters - demons. Plucked from the town’s residents they now spend eternity in sexual bliss exploring the new shapes of their bodies. Exploring each other’s bodies until they come to roaring climax again and again.

Sample: 

“There they are!” my friend grated.
“You have never seen the insides of one, to step on board this
train?” It’s a dangerous thing just to see what waits inside. We try to
quickly divert the train back where it comes from, but we aren’t always
successful and it takes its toll. We try to limit our exposure to it, but when
it stops on the tracks there are those times. It is then someone has to climb
aboard to discuss the situation with the conductor. We prefer sending
first-timers, or those with little experience with it. Only they are able to
comprehend the horror. The more experienced, well, they’ve grown too accustomed
you see. They might come back off. I’ve seen that happen too many times. Each
carriage is a cage of flesh. There are no seats or other comforts like you
would expect on a passenger train, just pens where the male and female of their
kind engage in constant breeding. It’s a goddamn zoo. You are first hit by the
smell. It’s a pungent stench the wreaks of cum and sweat. God the cum! There are
pools and ribbons of it everywhere. You can’t cross a single carriage without
some of it getting somewhere on you. It stains your clothes and soul.“

"I have witnessed the males milked as if they
were heifers. A petite creature, she looked like a tiny mouse, and had many of
the same features: the fur, the ears. The beasts that were breeding her stuffed
her every hole. They were big like horses. They should have been too big for
her small body to handle. Tearing her apart, but she loved it and demanded they
didn’t stop. I watched as one came inside of her. It was a good minute of him
grunting as his masculine fluids flowed into her womb. She was twitching in
pleasure with every pulse of his cock. I can tell you it was nothing like you
see in those dirty magazines. The beast’s prostate had to be bigger than a
grapefruit to put what he did inside of her. The pearly substance bubbled and boiled
out between the seams where his cock rubbed against the sides of her vulva.
There wasn’t much room for it to escape, but it had nowhere else to go. It was
so thick, like honey, and has this strange opalescence to it. I question its
properties. It is an unnatural fluid that goes beyond reproduction. It enhances
the experience they were having in some way. A potion that was both a lubricant
and a stimulate. Most dangerous, I’m afraid, is that it has transformative
powers. My research isn’t conclusive, but still I am certain that it can be
dangerous if exposed to it. That is why it is imperative that we send the train
back quickly so as exposure to the alchemic brew that churns in the bodies of
breeding beasts is not allowed to taint too much.”

“Then why don’t we stop them like we used to,
you may ask? Well, I would like to say because they bring us no harm. They are
not malicious. Their ways are alien to be sure, but they are a playful sort.
They come with intentions of goodwill in ways they only understand it. They
remind me very much of those Bonobo apes who have sex for pleasure, recreation,
and a social bonding. In the case of those that ride that train, it has warped
their bodies to be carnal instruments of lust. It is almost as if some
perverted god is experimenting with the pleasures of flesh. No two monsters
were the same. There is no particular species that can be determined within the
chambers of that train. Some have fur, some have feathers, and there are scaly
ones whose scales feel like slick ice, if ice was warm and comforting to touch.
They do like to touch each other and feel the very different textures that each
have and each share. They explore with every part of their bodies. They lick
and kiss, they caress with their claws and tails. They rub semen into their
partner’s bodies as if it were a lotion, and I think it helps them gain more
features for them to touch and explore.”