At the start we all thought Dave’s wife Kerry was cheating on him. Dave worked with me and two other guys - Chris and Cam - in a refrigeration engineering firm and Dave’s wife Kerry ran the office while the owner of the firm, Rick - known to us all as Prick - seemed to do fuck-all in his office.

We joked that Rick’s browser history would be worth checking out - likely the best porn sites on the internet. The other side of the joke was that he wouldn’t be smart enough to know he had a browser history that he should probably be cleaning up every now and then, or that incognito was a thing.

Kerry was in her 30s, deliciously curvy with sandy blonde hair, a cheeky smile and a wicked sense of humour. Her Irish accent made her even more sexy and added to her cheeky, naughty vibe.  She could hold her own in any workshop banter and would often drop sexy innuendos into our blokey workshop smoko chats, and flirt right on the edge of leaving us wondering if she was really just joking.

It was a casual office, but Kerry always looked great. She dressed simply and in a way that made the most of her assets - a great ass and shapely, firm breasts. Dave never answered our cheeky questions  about whether her breasts may have been the result of a surgeon’s intervention - they were that perfect -  but he seemed to enjoy it when we ribbed him about it.

More than once we’d come back from a job to find Kerry leaving Rick’s office flushed and slightly ruffled.  And while Rick was a prick to everyone else he seemed to have a real soft spot for Kerry. In fact she seemed to have him wrapped around her little finger.  It wasn’t just me who thought Kerry might be having an affair with the boss.

Recently I started noticing Kerry spending time in the worksop and in the yard with Cam - the youngest of the team. Good looking, 24, tall, fit and muscular, Cam was never short of a date. I couldn’t be sure there was anything going on between them but last Friday removed all doubt.

Chris and Dave were offsite at a job. Prick was in his office talking loudly on speakerphone. I was in the workshop and Cam was in the yard around the back doing some maintenance on one of the trucks. When I noticed Kerry’s office was empty I decided to have a look around.

Going outside and peering around the corner I saw Kerry and Cam behind a stack of pipes kissing passionately. Cam’s overalls were unzipped and Kerry's arm was inside his overalls moving quickly. Any doubt about what she was doing was removed when she pushed his overalls off his shoulders leaving him standing there with his cock sticking out from the top of his shorts. She continued to stroke him before squatting down in front of him and taking his cock in her mouth.

Cam held the back of Kerry’s head as he fucked her mouth slowly at first and then with faster strokes. She held onto his thigh with one hand and reached down between her legs with the other. She wriggled her skirt up to spread her knees further apart, exposing her shapely ass and black knickers. She rubbed herself through her knickers for a while before moving them aside to finger herself.  I found myself rubbing  my own cock through my overalls watching.

Kerry stood up and raised a leg up on the stack of pipes they stood behind. Facing Cam she continued fingering herself, watching intently as Cam stroked himself furiously.  It wasn’t long before she came, with a moan she tried to suppress, and a splash of juices on Cam’s boots. This obviously pushed Cam over edge. Moving closer to Kerry, they started kissing passionately. Kerry pulled the front of her knickers down revealing her shaved pussy as Cam continued to stroke himself. Aiming his cock at Kerry’s pussy with a few final hard strokes and a guttural grunt he shot a thick load of semen onto her pussy and into her knickers. Kerry reached down, grabbing Cam's cock, rubbing it over her pussy and sliding the knob up and down between her wet lips.

I was tempted to keep watching, but not wanting to be caught, I ducked back inside, my cock achingly hard. I made an effort to work loudly and pretended not to notice when Kerry casually walked back to her office.

Only a few minutes later, Chris and Dave pulled into the yard returning for lunch.  Kerry left her office with her handbag and car keys and went into the yard to greet Dave.  “It’s home for lunch today, remember?”.

They lived close to work and would often go home for lunch.

“How could I forget!” Dave shot back. “Leftovers!” he shouted happily.

The rest of us ate lunch in the smoko room while Prick continued screaming at someone on his speakerphone. Cam didn’t let on anything had happened but I couldn’t stop thinking about what I’d seen, and my cock pulsed and ached every time I thought about it. My mind wandered thinking about what else might have happened.

I pictured Kerry on her knees under Prick’s desk, sucking him off as he watched porn on his computer.

I pictured her bent over his desk with her skirt around her waist as he fucked her from behind.

I pictured her in the truck with Cam - sitting astride him in the front seat, riding his cock while he sucked and played with Kerry's tits, reaching around behind her to finger her tight asshole.

I pictured Kerry on her back, freshly fucked with her legs spread and a trickle of come moving down her pussy.

“Matt! Matt! For the tenth fucking time get in here!”.  I was snapped out of my fantasies by Prick calling me into his office.