I've had a couple of neighbors that I would watch.
I lived in this old neighborhood where the houses were only maybe 12 feet apart. I lived on the main floor of a house, and this married guy and his wife lived on the upper floor of the next one. Some of my windows, and some of theirs, faced the shared space in between.
So one night I came home from the night shift at a restaurant, went inside my place, and went to the kitchen to get a beer. As I was opening the beer, I looked out the window and saw the bathroom light was on at my neighbor's place. No biggie. Whatever. I'll also make note here that my kitchen light wasn't on, just a dim light from the living room. So, I'm sipping my beer and having a bit of something, and I notice my early 30s married neighbor enter the bathroom in his robe. I thought he was going to brush his teeth or something, so did not expect to see him open his robe right in front of the well lit bathroom window and start jerking off at the sink.
He did that for a few minutes, which got me raging hard, then he looked over and saw me and turned off the light. Shit. The next day, I turned off all the lights and parked in front of the window again around the same time. This time he did the same thing, but he shot his load and then went back to bed. This happened a couple of more times, but I think he knew I was still watching, as one day he went to his dining room window which was directly across from my kitchen window, but maybe 3 feet higher. The lights were off on his side, but I could still see he was there, and he was facing me, robe open, jerking off.
That went on for a summer, with me letting him see me a couple of times, and him occasionally opening the window and shooting his cum into the space between our houses. Honestly, it was fucking hot. But, one night when I was still at work, I guess he was also putting on a show for my upstairs neighbor and his landlady caught him. So..eviction for him, and she also called the cops.
Fond memories though.