One time I had to work on a Saturday alone. I thought of how forbidden it was would be to jack off during the week, but all alone I got hornier and hornier, and eventually was so hard that I had to jack, right in the middle of the room. I had my back to the door, and didn't notice that a guard was making his rounds and was watching me, until he moaned. I turned around to see him with his cock out and jacking as well. We stared at each others cocks and kept jacking until we both came. Whenever I see him, I nod or wink and we chuckle to ourselves. We have never spoken about it.