(Author's note: for those who haven't figured it out, the Meyers family that appears in this story is the same Meyer's family that first appeared in "Family Vacation". I had my head up my ass when I submitted the first chapter of this series and neglected to mention that fact.)
The room became silent the second that Marie, Ross, and I stepped into it and yelled "Surprise".
The scene had shifted a little in the time that it took us to get undressed. Lisa Meyers had moved over to my mother and had started licking her husband's cum off of mom's tits as she was fingering mom's pussy. Debbie Meyers was on her knees between my dad and her dad and was licking the cum off of their still hard cocks and balls. David Meyer was kneeling over my mom's face and was slowly fucking her in the mouth; his dad's cum covering both mom's face and his cock.
Everyone stopped immediately and looked at the three of us Barkley kids. The mix of reactions to our sudden appearance was almost comical. My mom and dad had a shocked look on their faces. Dad's cock immediately went limp even though Debbie was lustily sucking and licking it. My mom's mouth fell open where an instant before it had been tight around David's dick. I could see Mike Meyers cum still glisten on her tits and face. The collective gasp from the two of them almost created a draft through the door.
The reaction of the Meyers family was much different. When my dad's cock went limp, Debbie just smiled at us and changed over to her own dad's cock, taking it in her mouth and stroking the skin as she sucked. She was obviously looking at me and my brother's hard dicks and even let her eyes wander over Marie's delicious body. Mike Meyers just petted her hair while she sucked his cock. He smiled at the three of us while looking at my parent's reaction to our appearance and nudity. His hips moved gently as he continued to fuck his daughter's mouth.
David Meyers, apparently feeling a little awkward being caught with his dick in our mom's mouth, sat back on his heels. His hard cock popped out of mom's mouth and slapped his stomach with an audible "thwap". He had a sheepish grin on his face that seemed to say "Oops, sorry, but your mom gives such great head I couldn't help myself". Lisa Meyers stopped sucking mom's tits but still continued to finger her cunt. She looked over at us and winked. I could see her husband's cum shining on her cheek where she had gotten it off of mom's tits.
Dad was the first to speak. "What the hell..." He couldn't seem to find any more words than that.
Mom wasn't any more articulate, "Oh my god..." was the best she could do.
Marie took the lead. She reached down beside her and grabbed my cock and Ross's cock. "Happy anniversary, mom and daddy. Mom, I brought you something I hope you like!" She had a big shit eating grin on her face.
"Oh honey, I'm so sorry you found us like this." I thought mom was going to cry from the embarrassment.
Marie immediately let go of our dicks and went over to mom and hugged her. "Oh mom, please don't be sorry or embarrassed. We are all adults. We know you and dad have sexual needs. We didn't realize what those were, uhm, exactly, but we love you and, well, and... and we love you." Marie had seemed to run out of words too. As they hugged, Mike Meyers sticky cum spread from mom's tits to Marie's tits.
Dad looked at us, his two sons, standing there with hard cocks. A sheepish grin spread over his face. "Welcome to the party. You know our guests, of course. You've seen them before, just never quite like this!" That broke the ice and everyone breathed a sigh of collective relief. Even mom had to laugh a little.
By now the looks of surprise in the room had begun to change to looks of desire and lust. There were now nine nude and horny people in the room: Mike and Lisa, their two children, David and Debbie, and the five members of the Barkley family, Mom, Dad, Marie, Ross, and me.
While it was readily apparent that the Meyers' were perfectly comfortable with the idea of fucking each other, this was all new to my parents and us kids. I was enjoying looking at my incredibly sensuous mother while Lisa fingered her but I wasn't ready to fuck her. This was going to take some getting used to and a little mental adjustment. From the way things evolved over the next few minutes I could tell Marie and Ross felt the same way.
I moved over behind Lisa who by now had her face buried in my mom's cunt. Her ass was in the air, open and I could see her pussy was dripping lubrication waiting for a cock to fill it. I could see her son's cum was still dripping also, but I never minded sloppy seconds. On my knees behind her, I rubbed my hard cock up and down her slit a time or two and then began to ease it into her. She stopped eating mom long enough to look over her shoulder. She smiled at me.