You have crossed the first hurdle. No woman will allow a man to see her boobs, much less to touch them if she is not interested. So you have made great progress. When you suck on her nipples and squeeze her breasts, she would be greatly excited. Read my recent article about nipple orgasm in a woman.
You admit, that you both were poles apart from each other, so obviously it is going to take time for your pole to meet her hole. You need to be patient and not rush things. Remember she is married and has to consider her home front too.
For a woman, trust is everything. The more she is able to trust you, the more clothes she will shed. The essence is that you should be able to control your lust. This is difficult for a man when he has an erection and wants to have an ejaculation. But think of the great time ahead, when she will be not only eating out of your hands but any other part of your body that you want her to eat!
In your comments, you have mentioned that you have not her that you cannot commit about not fucking her. This will put her on alert. What you should be doing is go with the flow on that night. See how far she can control herself, not you. (Good idea, to carry condoms though).
Also, from what you have now stated, she is falling in love with you. Are you prepared to handle this development? A woman gives sex to get love, a man gives love (or pretends?) to get sex.
I am surprised that you are able to caress her boobs in the office. Not a good idea, as invariably you both will get caught and will be embarrassed.
Be patient. Shower her with love, flowers and gifts and see her melt in your mouth (your cum in her mouth)!
Do keep us posted about your progress. We would like to know if our ideas are working.