I was visiting a local charity shop looking for bargains and I found a pair of jeans that I liked. I asked if I could try them on and the shop assistant pointed at a changing room at the back of the shop. I took off my trousers and became aware of a lady browsing on the other side of the curtain. I started to get aroused by the fact that this woman was only a few feet away so I took off my T shirt and briefs and started -playing with myself. I noticed that I hadn't fully closed the curtain to the changing room and I carefully opened it wider. I saw that the woman had started to move away and I coughed to get her attention. She looked over her shoulder as I pulled back the curtain to reveal my boner. "Oops" I said. She just laughed and said "Never mind. You've just made my day". I mumbled an apology but she moved closer and said "that's a big one, Nice and thick ". She reached out and stroked my cock gently. There as just enough room for two in the changing room as se unbuttoned her shirt and pulled up her bra to reveal two magnificent breasts. I squeezed them and played with her nipples until all too soon I climaxed and shot my hot spunk into her waiting hand. I never did find out whether the jeans would fit me but my shopping trip had been a great success.