The war with the sentient machines wasn’t going well. The human resistance, in a desperate move, detonated nuclear weapons raising massive clouds of ash & dust. This was intended to cloud the sky, severing the machines from solar power.
It did.
But the machines found an alternate power source: the female body. The contractions of a single vagina can produce over 10 megajoules per day. A simple hack into the databases of the valley’s largest porn studios turned up willing victims. Thus the the two-stroke reciprocating pussy engine was produced, birthed from the same muscular canal as humans themselves.
