Creep to the basement.

I rushed downstairs and immediately realized it was probably a bad decision. The couples that didn't know me kept on fucking and sucking thinking I was just another member of the party- albeit a little younger than the average fourty something there. But my mom sure as hell knew it was kind of strange to have your college-aged son see you sprawled on your back and having your pussy licked by a stranger.

She practically screamed "What are you doing here?" I told her the genesis of my surprise trip. She and Dad looked at each other for what seemed like a long time. By now the guests had all figured out what was going on and some of them were reaching for the few shreds of clothes around them, embarrassed but also frustrated that they were so close to climaxing.

My Dad somehow still had his erection strong as ever despite the turmoil. He looked again at my Mom, then at me, then back to his dick. He grinned and said "Son, there's enough pussy to go around if you want to join us." That's something very few sons ever hear- especially with their naked Mom two feet away. I was absolutely confused.