Slave of Misery

Today started as any other day. My little brother Samuel was still sound asleep while I got up making breakfast letting him sleep as long as possible. We ate and left immediately. We never stayed in one place for more than one night. Thats the way it's been since the apocalypse.
We got on our way, I had two pistols a shotgun and an M16. Though he was just 10 Sam always carried a revolver. I really didn't know what kind of gun it was to be honest. It was nescissary given the circumstances.
3 years ago a government bio lab produced a bio chemical called RC12. Developed by Dr. Richard Cole, it was made to erase a humans mind and all human characteristics and emotions, it also built their muscles turning them into the perfect soldier. But their test subjects all went mad with rage and forgot everything but basic instincts. Their muscles are forever growing and in order to sustain themselves and their ever growing bodies their first objective is to feed. They were called many things, zombies, demons, buffies, and IO's.
They tried shutting the lab down but Dr. Cole took a surynge of the virus and injected his son letting the monstrocity loose. The first outbreak was the other students in his sons class, which spread to their teachers and parents, after that it was the begining of the end of humanity.
They evacuated and burned cities. They tried establishing surviver camps, but they all failed with outbreaks and attacks from the demons. There was a romur that some lab in Virginia had controlled and tamed the virus and could vaccinate and modify everyone. Thats where Bailey had gone 5 months ago. To get vaccinated and modified. I held him at gunpoint telling him he wasn't going, but he left. I woke up one morning and he wasn't there.
My heart throbbed at the thought, but it didn't last long. There was a noise less than 100 feet away. It was a terrible scream that made both of us cringe. It was a stage 10 demon, which would take 6 normal people and 3 times the gunpower to kill. Here we go.