Tom Watson started out sexually servicing his mother and two sisters before he even had a girlfriend. By a quirk of circumstances, he and his girlfriend saved his middle school from an attack by some Muslim terrorists, and killed four of the terrorists in the process. Guess what: this got them thrown out of school. Eventually, those two and Tom's sister became vigilantes. Of course, for fun, there was a lot of sex.
Eddie is an adult and married unhappily. Business travel gives him the opportunity to visit his sister, Beth, who had begun his sexual training when they were teens. Now, it's time for Eddie to finally consummate his relationship with his sister.