Each step in this place is slow and treacherous, the dense surface is threatening to pull you down or trap your shoes.
You feel something moving, you try to run, but the viscous surface makes you slow, and a huge one-eyed slime surges from a pit and envelops you completely.

You struggle to find air and you push against the slime, trying to get out, but you are suffocating. A tentacle is connected to your mouth and you start to breathe desperately... you notice your clothes dissolved by the creature and you continue to struggle.

Exhausted, you stop struggling, and you breathe through the fleshy tube of the monster.
Disgusted, you notice big balls of some kind of egg, it's looks like jellified cum is coming into your mouth, you are forced to swallow them like huge pills, or you are not allowed to breathe. With disgust, you swallow each one of them, until your stomach hurts. More than once you experience a terrible gag reflex, because of the slimy texture that tastes like bitter cum.
You continue to struggle inside the creature, in panic, trying to free yourself, but the worst is going to happen. Your belly hurts badly, desperate you notice how the creature inserts another fleshy tube inside your ass, you scream in pain, but no one listens to your muffles screams. The tube invades your rectum deeper, and suddenly, you feel some relief from your pain, your start to expel a huge white slimy egg inside the tube. the creature grabs it and spits it on the ground.

One after another, you give birth to a dozen of slimy eggs, your ass hurts, and with horror, you notice more jellyfied cum coming to your mouth.

You are trapped inside the creature giving birth to more and more eggs, but after some days your body is too weak, you you notice that your skin is greenish, you are being dissolved and assimilated.
In less than a week you are part of the slime and no one finds any trace of your existence in the upside-down.

THE END
Slime assimilation ending

Task: Prepare 3 hard-boiled eggs inside a condom. Take a large blanket, get under it, struggle, and imagine the slime swallowing you. Insert a small long dildo in your mouth and trigger a gag reflex. Swallow 3 small rounded ice cubes and act disgusted. Insert the dildo again and trigger another gag reflex. Insert a long soft dildo in your ass and move it for 2 minutes, struggle and hold your belly, and think that it hurts. Take off the dildo and insert the 3 hard-boiled eggs inside the condom in your ass. Push and expel them.