It had been many days since the outbreak began. Surprisingly, the local world had held up quite well. The lizardfolk that now populated the streets were surprisingly mentally intact, choosing to keep brute force tactics out of the picture over just simply convincing the population to give up their humanity. Daily door-ringers would come by, offering to change you into a lizard, describing the benefits of becoming reptilian, et cetera.
However, not everyone was necessarily onboard with the takeover. You, in particular, were a vocal critic of the lizardfolk invasion. The bizarre thing is, the lizardfolk had no issue with you airing your grievances. In a strange way, they seemed almost more civil than the dwindling human population.
Unfortunately for you, the situation began to degrade after the third week of the takeover. As the lizardfolks' mutation progressed, many became different forms - some capable of flight, some capable of incredible swimming, and so on. However, the most common change seemed to be feralization. Many of the lizardfolk were becoming quadrupedal, along with losing any remaining human features, excluding the size. At the fourth week, you could look out your window and see an army of human-sized lizards lining the streets.
Along with their bodies becoming more feral, their mind did as well. You now had to actively defend yourself from the more feral lizards. Hell, even the average lizardfolk had to defend against them - they were complete sex-crazed, violent lunatics, and a few humans, along with a lizardman, fell to the ferals - either being turned completely feral or being flat out killed.
By the fifth week, there were bands of anthropomorphic lizards and humans living together, united by a mutual enemy, completely contrary to what was expected of the Reptilian Apocalypse. You were part of one of these bands of creatures. Despite your vocal criticism in the beginning of the apocalypse, they have welcomed you with open arms, perhaps partly for your ability to aim well with a gun. You didn't want to kill any of the lizards, after all, they were once human - but it was life or death out there.
However, on the fifth day of the sixth week, an emergency arose. You woke up to hear the grunts and growls of a feral lizard mounted right inside one of your friends, who was audibly moaning. Your door was wide open, clearly being destroyed and broken into. Though it was fairly obvious to kill the lizard, other thoughts went through your head - escape, go back to bed, maybe even let him take you...
You snap back to reality. You're not quite sure what happened there, but you know damn well something needs to be done.