Dark Slime
The audio includes a being made of permeable slime; often able to shift in size or shape, and to hold a humanoid form.
In this deliciously sticky script, you and your friend have wandered deep down into a dungeon together. Looking to slay some monsters I suppose, though I have a faint suspicion you both wanted some alone time. Just too afraid to admit your feelings together, you explore your way deep down into the lair of a Dark Slime... Noticing the sexual tension between the two of you, she instantly decides to have a bit of fun with the both of you!