Find part 1 here. http://www.reddit.com/r/gonewildstories/comments/33ti83/wifes_birthday_party_turns_into_sex_party_part_1/
Suddenly Isabelle rose to her feet and walked over to Anna. She pulled Brian away from Anna's pussy, flipped her hair back and knelt down. Brian's teasing had her tight hole flowing with juices and Isabelle dove straight in. It couldn't have been more than about a minute before Anna's back was arching as she let out a cry that I knew all too well. She was having an orgasm but it was intense. I had only ever seen her that crazed once or twice. Brian stood over the scene now totally naked jacking off his erect cock. Isabelle didn't let up and would give her 2 or 3 more body shaking orgasms.