When I was in a student flat there used to be a convenience store right around the corner. Every so often I'd dress up in my sexy lingerie, suspenders and all, and head out with my just my winter coat covering me to go shop there. I'd get so wet knowing I was undressed underneath and no one knew. I'd always have the best orgasms when I got back to my flat, usually by stuffing whatever I'd just bought up my cunt. A couple of times I even did it fully naked under the coat, but I had to feel really filthy to risk that.