(I wanted to do this as a Resident Evil-like story with even crazier mutations, if you want to continue it feel free to add a chapter)
Many years ago a corporation called EVO INC. discovered the mutation liquid which quickly they discovered it had fast mutation properties that turned people into aberrations, they decided to secretly test it on humans and go beyond the limits of human body calling it the "definitive evolution", after many testings EVO INC. decided to put the mutation liquid in many sources of water to mutate everyone, their plan successfully worked and a great amount of people were sexual mutants in less than a hour, moments later people discovered that EVO INC. was behind everything but it was too late.
Fast forward to the present day the world is almost dominated by sexual monsters, some of the survivors transform themselves into mutants following EVO's "definitive evolution" or blinded by the power they could get transforming themselves into monsters, meanwhile the mention corporation was completely dissolved and is rumoured that many scientists are alive testing the liquid on themselves or creating their own creatures.
Vanessa and Will were searching for their friends Mai and Cassie that got lost in their way of running away from a strange female humanoid octopus-spider mutant.
"I can't believe those two got lost again, why is it so difficult to follow us?" Will yelled.
"Calm down, I'm sure they scaped from that freak" Vanessa tried to calm him.
"Yeah but do you know what I noticed? Mai has been very weird these last days"
"What do you mean?"
"When we scape from a monster she's always the last, I feel like she runs slower on purpose like... She wanted the mutants to grab her"
"Don't say that type of things, but now that you mencioned it I noticed that in Cassie"
"Please don't tell me that they..."
Before Will could finish they heard something quickly approaching them giving Will and Vanessa a couple of seconds to react, before they decided to stay or run they saw something came out from a pair of bushes