Colleen and Maria are horny. Their big cocked younger brothers won't fuck them. They swap brothers to get the relief they need. In the process, they relieve the boys of their virginity. Everyone wins.
As a desperate measure to save humanity from extinction, Dr. Olson releases a virus into the population that makes girls go into heat -- craving a great deal of sex during their rare fertile periods. They will go to any lengths to get what they need. Men and boys can smell their condition and are nearly as single-minded in giving them what they want so much.
The hot summer drought has spoiled the family vacation at the Cabin in the Woods. Fortunately Jake and his sister Amy find newly awakened feelings and entertain each other. My first attempt at an incest story. I hope you like it.
A younger sister and her friend find her brother lying on a weights bench with his hand stuck under the barbel. They'll free him, but not until they've had some fun.
Siblings make a bet over their high school grades, if he wins she jacks him off. He wins but things turn out drastically different... good, but different.