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Today is your last day of survivalist training and your stepmom is so excited for you to do well. Which makes it extra hard to tell her you didn't pass one of your sections when you get home, but she is very understanding and assures you that the test has gotten harder than when she took it during the 3rd zombie wave. But before you sit down for dinner, the alarms go off and the city has been put into lockdown. To say that lockdown is boring can't even describe it. You're both tired of listening to the state media saying this is the end of the world because, nothing ever happens. Soon enough, boredom turns to curiosity, and you start noticing step-Mommy's plump breasts and fat ass. step-Mommy starts noticing your large bulge and soon enough she proposes that you both get through this lockdown by creating a "free use" situation where you can fuck step-Mommy whenever you want.