I (f33) was sitting on my balcony having breakfast in my pj's. The sun was shining and it was a lovely day with a little breeze. I usually sleep in a vest top and shorts, without panties, so sitting on my balcony I could feel a nice breeze over my pussy every now and then. It got me turned on just being out there, so I slipped my hand down my shorts and I was starting to get wet. I was just playing with myself for a while letting my organs build slowly when I hear my upstairs neighbour on his balcony. I got super turned on knowing I was playing with myself just below this guy (who I think is quite hot) and I came all of a sudden. I wasn't expecting to cum right then as I was building it up and I let out quite a loud moan which I'm pretty sure he heard cos he went really quiet. As soon as my legs stopped shaking I dashed inside. Haven't seen him since, but I wonder if he did actually hear me or if it was just in my horns head!