Cathy (my boss) is in her early/mid 50's, thin, and attractive. Her husband also works in our office.
One Sunday while we were both working (there had been some mild flirtations in the past), she came up behind me to see what I was working on, I turned and her blouse had come unbuttoned down to her bra clasp showing off her small breasts, she leaned down as I turned and the inside of her breast touched my face. Without saying a word, I kissed and licked her exposed breast. She moaned and held my head to her. We were soon kissing passionately, and decided to move to a more secluded area. I was hard as a rock, and she could see my erection through the shorts I was wearing, and said she wanted to see it.
I said ok, but turn about was fair, and wanted to see her as well. We both stripped, and stared at each other and started to masturbate each other while we kissed. It wasn't long when we both came on each others hands. I stayed hard as I watched her lick her fingers clean, and she said she wanted more. This time she wanted to watch me jack off, and when I came she wanted me to come on her face and breasts. I did, and this time she wiped it up and once again licked her hands clean.
We still act as if nothing is going on between us in the office, but still have sessions when we're alone. Including her showing up at my apartment with only shoes and a coat on, and episodes at the park, which I'll talk about later.