Someone emailed a photograph to my wife of a nude man masturbating on a bed. The man's face was blurred but I knew who it was. I had taken the picture and the man was my wank buddy. My wife was amused, irritated and offended to be the recipient. “Why me,” she asked, shaking her head. The wanking man was a complete stranger to her. For my part, I took care not to show my panic. I doubted that William had sent the photograph which I thought existed only on his camera which we used that afternoon to record each other masturbating in an hotel room. William is also married. Our families do not know each other and neither of our wives know we are wank buddies or even suspect we have one. I am the only man William does this with as far as I know and I have no other lover, male or female. He's the first man I've had sex with since I was a teenager long ago. I told my wife the photograph had probably been sent at random by a pervert making mischief but she looked dubious. “It was someone who knew my personal email address,” she said. She peered into the computer screen as if a close examination would give her clues. She shook her head again and said “you men” in an exasperated sort of way. We were interrupted, thankfully, by the children coming home from school. She shut down the computer without deleting the email and I knew that meant we would come back to it. In front of my mind was the knowledge that whoever sent the picture probably also had the delayed action pictures of me and of me and William fucking together. Thoughts of blackmail or exposure burrowed into my mind. What would my wife say if she received an identifiable picture of me? Would she recognise me even if the face was blurred? Who was doing this to me? It wasn't William. “Are you nuts?” he said when I asked him. We'd met in a car park, he thought for a quick session. My news put it out of his mind and he rebuttoned his trousers. He messaged me as soon as he got home to say that his camera's memory card was undisturbed and the camera still hidden. He'd checked hs wife's computer and there was no trace of the picture or of an email to my wife. It's been three months and it's still a mystery and I pray it stays that way. Somebody has copies of these pictures of William and me masturbating and fucking each other and could publish them any time. We have no idea what our wives would say if they saw them. Or colleagues at work. I know my wife who's a church-goer would be pretty disgusted. As it is, I suspect she has vague suspicion that I'm connected with the picture but can't work out how. But it surely wasn't sent to her by coincidence. It was five weeks before William and I felt safe enough to meet for sex again and we were nervous. “It seems crazy but I can't give this up,” he confessed as I sucked his cock. I feel the same way. The funny thing is that after every session with William, I feel the need to fuck the daylights out of my wife and she loves it. But I live in terror of her finding out the origin of all that sexual energy.