I was sitting at my desk with my maths books in front of me. I had to learn some stuff but didn't really feel like it. While flipping through the pages I was fondling my penis with the other hand through my jeans. This I do almost every time when I'm doing stuff for university and sometimes in the library or else I really regret not being able to do it there.
Anyway, in the corner of my eye there was a movement so I turned my head to see what was going on. The curtain of the window across the street was fluttering a little, but I was sure that there was someone behind it. I just went on, glancing to the left from time to time. Finally I noticed a figure standing at the window. I realized that it was the woman, about 30-years-old, who lives across the street.
I don't know her, but I've seen her a few times since I moved in a month ago. She was watching me and I didn't really know what to do, but I felt a thrill. I took off my shirt and unbuttoned my jeans, getting out my erect cock. I checked if she was still observing me and continued stroking. Once again I caught a glimpse of movement and she disappeared. What a pity I thought, didn't she like my show?
But then she was back. She had pushed the curtain to the side and was standing a little away from the window. Since we both live on the top floor, nobody else can see into my room and vice versa.
But the best of all: she was nude. So I turned towards her and examined her body. She is quite tall but has nice little breasts and quite a thick bush. She was fondling her breasts and playing down there while she watched me jerking. It was such an electrifying situation that I couldn't hold it back for long and looking into her eyes I shot my load on my stomach. She was smiling knowingly and kept playing with herself. I'm not sure if she actually came, because at some point she disappeared after looking back, maybe the telephone rang or I don't know what.
This happened two days ago and I haven't seen her again since then. I check the window regularly but I only saw her husband. Hope he doesn't know anything.