Custom - There has been a Zombie apocalypse. You and your mom have just escaped some when you fell in to a river. You need to get back to your tent to warm up. Mom suggests you both take your clothes off and snuggle skin to skin to warm up. You cant help but get aroused by your hot moms nakedness and your hardon sticks in her back. She suggests that actually if you have sex it will warm you both up quicker and perhaps its both their responsibility to re populate the earth together..