I walked in on my neighbor's hubby jerking off.
Being good friends with the couple who live in the apartment next door to us, we have keys to each others place and help ourselves to items in each other's kitchen or fridge that we may need to borrow.
Well it was during the day and usually they're both at work, I ran out of milk and went next door to borrow some milk, as you walk in their place our neighbor has his home office in the room straight in front of the main door. As I walked in he was home and was naked in front of his computer, jerking off to online porn.
I caught him and he was startled and embarrassed, I was just shocked, but asked him if I could watch as I've never seen a guy masturbate before. As my hubby hides his masturbating from me, at first he didn't know what to do, but then I told him that he was making me wet and I'm going to go home right after this and get my vibrator out.
Just saying that sprung his cock so hard that he continued to jerk off again until he came, while I stood at the door way and watched. He knows that we're both married and we live next door and that we can't cross that line to have sex with each other, but I told him that I'll keep the bedroom window curtains open in the future, and the next time he has a weekday off, maybe he can catch me with my Hitachi Wand, if he's lucky.
I told him this can be our little secret.