[Obironic]

A few months back, my brother in law (sister's husband) gave up his weekend to help do all the heavy lifting as my wife and I were moving house.
It was a long hard slog and by the end of it, I genuinely felt I owed him for all his help.

Knowing he has always had a thing for my wife, I hatched a plan. Whilst he was having a shower on the second evening, I booted up the laptop and pulled out a folder of my wife's pictures, ranging from underwear, to topless, to fully nude. There were about 45 pictures, with an even spread of each type. I also put in 2 legs spread, everything on display pictures, then changed the thumbnails to just show the file names - dsc00987 etc.

When he came down, I took a deep breath then laid out my proposition for him - to thank him for all his help, if he wanted, he could open any one of the files in front of him. I explained that there were a load of underwear shots, but also fully naked ones (I didnt mention the spread leg ones) and offered to either let him pick one at random, or I could show him a topless only shot.

He mulled it over for a few minutes, then said he would chance his luck of finding a fully nude one. He took the mouse and hovered over each file ready to click. I'd love to say I was hard as a rock, but I wasn't - I could barely breathe with the anticipation as he moved from one pic file to the next. I knew the two spread shots were half way through the pack and they seemed to be where the mouse gravitated toward.

I started to think that maybe I'd gone too far in putting them in there, but it was too late by then. Eventually he chose a picture and clicked on it - the file showed my wife topless, looking at the camera, with a wicked smile on her face, but it was one of the tamer ones. The next file down, was a gratuitous, legs spread, fingers inserted picture, absolutely everything on display.

It was still unbelievably erotic to show my B-I-L my wife's tits, but when I jerk off thinking back to that night, I always come hardest when I imagine him clicking on the next image down.