The work Christmas party was going full swing and by nine o'clock most guests were drunk. I sneaked through the exit doors with Petina to have a quick spliff on the stairwell. We heard the sounds of sex as we climbed the stairs. I went red and Petina giggled.

"Lets have a look!" she said. We quietly climbed the rest of the stairs until we could hear clearly and then see our young receptionist Mary clumsily giving a blow job to one of our ugly but well endowed van drivers.

She was wanking him into her mouth and he was grunting his satisfaction. He gripped her by her blonde hair and then pulled out of her mouth spraying cum all over her face and hair.

I felt my cock get really hard at this and it started to pulsate. I turned to Petina to encourage her to quietly sneak away only to find her rubbing her tits in a distracted sort of way.

Rob the van driver started to finger fuck Mary and the sounds of her building orgasm were hard for me to bear. Petina gave my crotch a firm squeeze which shocked me. My head was now filled with dirty thoughts and the stairwell stank of sex.

I pulled Petina away back down the stairs hoping she would keep quiet. Her drunken state precluded this and as she stumbled and exclaimed you could hear a squawk from Mary followed by her man of the moment popping his head around the corner to see who was there.

As soon as he saw us we all started laughing crazily. They both came down to the landing we were on and Mary smiled. "Were you two at it too?" She asked. She boldly rubbed my crotch and then cheekily undid my trousers taking out my swollen cock. As Rob the van driver left chuckling the two women both started to lick and spit on my cock before alternately sucking on it and my balls.

I felt my cock twitch and then Mary ducked and stuck her head firmly into my buttocks and started frantically licking my anus. I came into Petinas mouth looking right into her eyes as she swallowed all my spunk.

My head reeled with the sex and the drink as we tidied ourselves up. I wanted more but Mary had other ideas. "Hurry up and get back to your wife!"