Our hero Jonathan sneaks back into the house and discovers his brother in a bedroom after being freshly milked for his sperm and freshly-screwed by the vampire Natas. The thought of his poor brother taking a vampire's nasty dick in his rear is enough to get Johnny really upset! Only suddenly, Johnny has himself to worry about, as they capture him. Johnny gets some classic 1970's bondage treatment before the Sons of Satan inititate him into the "hour of exchange" cock sucking and to his horror--his brother is one of them! After they fill the silver cup, Natas arrives and then promptly gives Johnny a good screw. SPOILER ALERT! The last scene is a delivery guy who arrives at the old house and the door is opened by---converted servant/slave Johnny!
The Sons of Satan script is so darn bad that it's fun. Their plastic vampire teeth appear to be the Halloween costume type that stores sell three-to-a-pack (back then they were dime stores and today at dollar stores) and the actors have a problem keeping the fangs in place. Aside from classic 1970's men having sex with one another, this movie doesn't really have anything going for it, other than it was directed by Tom De Simone who went on to make mainstream movies like 1981's Hell Night. The actors are Ned Burke, Carl Ford, Bill North, Lee LeMay and Tom Paine. Most of this cast had already worked together in the 1972 gay smut film Chained, which was also directed by Simone (using the name Lancer Brooks).