Mother allowed her daughter to be fucked in exchange for food

In the near future, overpopulation has reduced the earth's resources, industrial food supplies have dried up, and most people have died of starvation. The few survivors united into gangs of cannibal marauders. The main character lives completely alone in a deep forest, until one day a mother appears on his doorstep with her 15-year-old daughter. They ask him to share food in exchange for jewelry and seeds, but the man rejects their offer. Being in complete despair, the woman sees no other way out and offers sex with her young daughter in exchange for food and asks for only one thing - not to cum in her...
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