It was last summer when I arrived home early one day. As I put my things down I heard a noise from upstairs. I quietly started to go up just before I got to the top I could see my stepdads bedroom door open. I could see his legs wide open. I didn't want him to hear me but needed to see more. I moved a little more, there he was laying on the bed slowly wanking away. By the way although he is 46 he is fit as fuck. I've seen him in his tight boxers and he looks like he has a good thick cock, and many times have masturbated when I can hear him fuck my mum, he goes on and on.
Anyway, he started to pull himself a litle harder and faster, his breathing got heavier. I could feel my panties getting wet but I couldn't make a noise. All of a sudden he came, his cum going all over the place. I went back downstairs and then shouted out was anyone in, pretending I'd just come in, he called back. When he came down we chatted, but all I wanted to do was cum.
When I did go upstairs I was naked in a second fingering my wet and aching pussy. I was just picturing him wanking and thinking of him fucking my lucky mum. By this time both my arse and pussy had fingers up them, I had the most intense orgasm.
Since this happened when he's around on his own I walk around sometimes with just a long t shirt on so he can see my nipples poking through and a glimpse of my tiny g string. I know he goes off and wanks away, but when he does I do to. I'm so wet now writing this I'm off to play with myself again.