(M 50) A F(27) coworker asked me to help her shopping at target, I agreed, we were always flirty but nothing ever happened. Anyway, we go and shop, and we are laughing and joking, and she says she has to try on this dress. So off to the fitting rooms, and I tell her I’ll wait outside, after a few minutes , she calls me in, there was no one watching the rooms, so I go to the door, she opens it, and is standing there with the dress half buttoned up the front, no bra, and no panties…. I’m instantly hard, she pulls me in, guides my hand down, and after that I needed no instructions, fingered and got a hand job. We left the store after that, have never spoken about it. I get aroused thinking about her, and occasionally she sends me pics of her mostly nude…