You are tugged into the snake house, and then to a relatively small cage. Looking inside, you are scornful. That is supposed to eat you? The snake is less than ten foot long, and can't weigh 50 pounds in the middle of a mud wrestle. You aren't about to do the exact math, but how can it eat something 2-3 times its size? Even if your hips are not monsters, they just won't pass such a tiny throat. Not to mention of course that you are not going to let it get a chance at you. You will just tie it in a knot.

A sudden jerk by your chains is the first warning that others have thought of this. Your chains are suddenly holding you stiff and extended. So you won't be able to resist the snake at all. But you are still an impossibly big meal. Do they really think it can eat you?

It seems so. Charles and some others put you on a ramp and you slide down to the cage. And not much further. Only your feet actually enter the cage, where they provide bait for the snake.
The snake takes its time coming for the food, and then checking it out. If you weren't furious anyway, you would be really annoyed.
Now the snake starts to feed, and you start to worry. There is no way it should be able to swallow all 10 toes, but it opens its mouth and your little piggies slip right in. Technically that doesn't mean much. There are lots of much wider parts of your body, not to mention your entire length. It still seems impossible it can eat all of you.
But it seemed impossible that it could even eat your toes...

Slowly your feet vanish, while you can only helplessly watch as more of you slips down the slide and into the cage; and listen to a number of unkind remarks from the audience. There is no sympathy from them, and, more worrisome, no sign they consider your consumption unlikely.
Now it starts work on your calves, and you have a new worry. It's touch is erotic, quite so. You begin to wonder if you fear it will eat you or hope it will. By the thighs, you begin to doubt you would try to escape if you could. Any bucking you would do would not be resistance. Then there is a clench deep inside you and even an attempt at resistance ends.

Looking down, you see the snake is being extremely extended by your body. It has not reached your hips and already it looks like you are covered by a sheet of snake-colored plastic. Surely it can't stretch enough to get past your hips. Or is that hope more than belief?
The snake does slow down, enough so that its mouth provides you with a burst of ecstasy. And it becomes so extended that it is almost invisible. To the casual look, your loins are still exposed to the air. They definitely don't feel exposed...
As the snake engulfs your torso, you can only hope there is a bottom to its belly. But you feel none. What you feel is that invisible snake slowly swallowing you inch by inch, and your excitement reaching new heights. As your mounds are encased, you experience a blood-rushing climax that would leave you helpless even if you could do anything.
The snake continues to eat and you feel your head being covered. For once you can see out when you are inside. Not that you enjoy that. What you can see is a bunch of jerks laughing at you.

The snake then slurps up your arms, and starts to become visible again. As it reaches your hands, a quick look might make it seem you were wearing snakeskin booties, snakehead bracelets, and nothing else as you stretched out on the cage sand. But between booties and head is an extremely stretched snake body that has indeed swallowed you whole. As the last of your fingers head down the throat, you suffer a final explosion that seems more of an acknowledgment of the snake's victory than true pleasure.

The watchers wander off as digestion starts, and you notice the snake's skin is starting to darken, presumably from nutrition gained from you. Soon you are in a dark pit again, and nodding off..

Then you have reformed in Charles' room and he is asking you "Well, have you learned anything yet?"