The snake stops talking after its announcement and there's a great silence after that. All you can hear is a silent sound of something slithering on the grass.
It makes its way to your face and, looking at you, whispers "I have eaten too many prey in my life. They all went to my stomach, and it always feels great. But I'm always the prey... I want to find out how it feels like from the other side... and you are going to help me!"
You don't know what any of this means, until the snake pushes its head onto your lips. You try to open your mouth to ask what was it doing, but as soon as you do, the snake simply shoves its head into your mouth. You try to grab it and pull it out, but you still don't have any strength in your arms. The snake travels to the back of your mouth and beginning of your throat and, after very few effort, it manages to enter it.
Quickly, more and more of the long snake slides into your throat, and you feel its bulge all the way to your stomach. You try to scream for help, but your sounds are muffled by your meal and there's no-one else around to hear you.
The snake's head makes it to your stomach and you feel your organ distending already from the weight of the big, willing noodle crawling into it. You notice how it has a raw fish taste as it travels down.
Now the widest part of the snake tried to go through your mouth. It manages to get in with some difficulty but, as soon as it reaches your throat, you choke. Its body was preventing the air from your nostrils to reach your lungs and as you cough, the snake stops sliding down, as the throat pulls it up and its movement pulls it down. When you are choking, however, you swallow a lot of saliva, which is enough to lube the snake and resume the swallowing.
You can feel your stomach bulging out below you a little as you see the tail of the snake, about to enter your mouth. When your lips shut behind it, though, you lift your hand to get up. Wait... you have regained your strength. In a jump, you stand up and try to grab the tip of the snake's tail inside your mouth before it slides down into your belly. First, you try to place both of you hands, but they do not fit in you mouth. Then, with you right hand, you try to grab its tail. However, it is too slippery because of all that saliva. Also, with the snake still bringing its entire body into your digestive chamber, plus the aiding gravity, it completely disappears in your mouth in a second.
The rest of the snake goes down your throat and into you stomach, which closes right behind its tail. Now the snake that had eaten dozens of different animals finally knows how they felt like first-hand. It was cramped, but it felt soft and warm -- which is even better if you are a cold-blooded reptile!
You don't know how to react to all of this. Instinctively, you place your hand over your stomach. It almost looks like you are a 6-month pregnant man, except for the squirmy living being inside of you whose snaky body could easily be told apart from outside because of the unique bulge. Now you just wait for what the snake will do next.