Getting Caught

This happened some years ago---I was 13 years old. been playing out with mates on the way home I went in to the brick shed we had for a smoke on the floor there was a picture of a women topless. picked it up started having a good look could feel my self getting horny. it wasn't long for me to get hard. Couldn't help my self I pulled my jeans down to the floor and started wanking fast and hard it didn't take long before I was cumming it shot every where on the picture on the shelf some hit the wall I stood for a moment turned to pull my jeans up through the window this older girl from next door was looking right at me I froze trying to get my jeans back on then she just walked of. I was worried for some time that she might tell my parents. after some time it got to excite me thinking about her seeing me. the one thing thats exciting is I dont know how long she had been looking. I would love to think she got horny seeing me wanking.