Sex addiction running in the stepfamily

The guy's girlfriend got along really well with his stepfamily. Well, perhaps maybe even too well. That night, she came around and saw the old man alone, watching the telly. The filthy geezer attempted to seduce her, and well, succeeded! Then stepmom came around and was abashed and enraged at the same time! Luckily the smart girl talked her into joining the game. Watch the three get it on like crazy all the way up to the moment the boyfriend came in. They couldn't explain what was going on, and well, how can you explain an orgy?