Disclaimers: I don't own this story. I don't make any profit of this. The symbiote and some of the characters are Marvel's creation.
NOTE: My writing skill is not good, leaving some comment, and I will try my best to improve.
NOTE: Most of the characters in my story are OC.
In this universe, the venom symbiote was caught by a group of unknown scientists.
When they were doing some experiments with radiation on it, they accidentally changed the character of the symbiote.
Originally, the symbiote was fed by the substance that produced when its host was under certain strong emotion.
However, after the change, the symbiote became tending to gain energy from absorbing the hormones and substance that human body generated when having sex and reaching climax.
In a giant glass-built cylinder, there was two black figure enjoying the passionate sex.
They both had teardrop-shaped eyes, sharp fangs, long thick tongue on their face, and monstrous claws. The only difference between them was that one had a rough dick covered by tar-like substance, and another one had luscious breasts.
Their tongue swirled around in each other's mouth. The male venom used his claws to squeeze the female one's big breasts, making her squeal a loud ecstatic moan. The female venom hugged her lover as the male venom put his big cock into the pussy in front of him. The dick covered by symbiote seemed too huge to enter the folds. The female felt the pain and ecstasy striking her brain at the same time. The male began to move his member back and forth rapidly.
"You...oh...you….are...so big." said the female in pleasure.
"This….is….fantastic!"
"Ah….Ah...Ah..."
Both of them moaned with strong pleasure stimulating every nurse in their body.
"I...I am cum ...cumming!" said the female in a gasp.
"Me..me...too." shouted the male.
They reached the climax at the same time. The male's sperm and the female's juice came out simultaneously.
The symbiote absorbed the liquid as fast as it could, it didn't want to waste any of energy it could get.
As a noisy sound suddenly rung out, the symbiote was forced to leave the couple it bonded with. Two scientists wearing the suit like chemical protect clothing came in, one gave the couple clothes to put on because the host needed to be entirely naked while bonding with the alien and the other one carried a machine looked like a vacuum cleaner to pick up the symbiote.
After completing the work, the scientist put the jar which contained the symbiote on the ground in the giant glass-built cylinder and left the lab.
However, little did they know, the whole process that giving energy to symbiote was spied by an invader. And the young thief was attracted by the alien and the desire of lust was growing in her mind.