On your back in some sort of stirrup

You yell and thrash a little as you attempt to free yourself from the gluey substance, only managing to pull your head free allowing you to look about. The room around you is likewise coated in the substance, the entire room humid and dark, though not pitch black. You freeze in terror as your hear a hissing noise. Turning towards the noise you yelp, the thing outside your window at last revealed to you in all it's hideous glory. Standing nearly 6 foot tall, the monster looked like it was made of glistening black latex, the skin a mixture of smooth shell and smaller ribbed-pipe looking muscles that clung to a skeletal, inhumanly thin body. Long tubes erupted from its back and a spiked tail curled behind it. Its head was elongated and eyeless. Bared metallic teeth opened and closed, revealing a second set of teeth within, only for the teeth to shift in and out of its mouth, connected to what could only be the creatures tongue. Grey saliva poured in a steady stream from its maw.

You stared in horror at the nightmare come alive as it slowly approached your trapped body, hissing softly. It stoops over you, its face inches from yours, making you whimper. It sniffs softly a few times, despite the fact that it looked like it lacked a nose or nostrils. Rearing back it screeched, making you jump and close your eyes, thinking it was about to tear you apart. You did hear something tear, but you felt no pain. Cautiously opening one eye you see the monster still standing over you, shredded clothing in its clawed hand. With a gasp of surprise you realize it had torn of your night clothing and left you basically naked aside from those few scraps that clung to the glue with you. With a sense of dread you realize what the creature wanted... It wanted to mate with you.