Grey/human hybrid.

The door opened.

You were now facing a short naked woman. She had a greyish tone on the pink of her skin, no hair,an oversized head , black eyes and small pointy teeth in her mouth.

The nose, ears and tits betrayed her human ancestry but they other points were too much to feel anything else than disgust for her.

"Mate" said the Grey in a speaker.

The female gave what could have been a smile in a human mouth, showing you a row of frightening teeth.

The color of her skin made her look sick and the Grey traits in her give her a mutated appearance.

The last thing on your mind now was to mate with that thing. But with the order and the push of a button you were now sporting a very long and very painful erection.

You didn't know if the pain was a sequel of the previous injections or their intended purpose but it felt like your dick was dipped in boiling oil as it grew to nearly twice the size you had before their experiments.

The female jumped on you like you saw the degenerate cousin of the Grey do while attacking in some videos.

She made yoi fall on your back, nearly bashing your skull on the hard floor.

She put herself over you and looked at the wall of glass.

"Brain!" She screamed in some wailing approximating of Grey language.

You were now scared shitless (well you were happy to have eaten so little or so long ago or you would have been quite literally scared shitless.).

Was she asking them to eat your brain?

You saw the head scientist touch a panel.

Closing your eyes in fear you heard a thumping noise.

When you noticed you were not dead you looked and saw a bloody piece of unidentified cerebral matter on the floor near you.

The female grabbed it and started to eat it, making some drip on your chest as she impaled herself on your dick.

You were once again happy not to have anything to puke.

To your surprise the touch of her pussy dulled the pain in your dick.

You soon understood why. They wanted to use you for breeding purposes so they made you feel pain with each erection until you were mating.

With the ability to make you hard on command they made sure you wouldn’t be able to resist putting your dick into anything they sent through that door.

Once you filled the pussy of the hybrid with your seed you felt the pain come back.

She left the room without a look back.

You looked into the other room, fulfilling your curiosity being as good as an other way to distract you from the pain.

The girl went back to a line of retraints and locked herself in.

The cuffs of the second of the 12 hybrids now opened.

12 near identical deformed abomination were waiting for you.

Worse you were in a hurry to see them enter your room, their pussy the only way to relieve you of the agony you endured.