@ticaaa,
1. She is married. You have no business at all flirting/hitting on a married woman. Even if she appears willing, it can only end poorly, especially because...
2. You work together. She can cause problems for you at work. What if your 1 night stand you desire is not what she wants and she decides to keep up the flirting and such at work and it becomes a distraction to you or to others? People will notice, talk will start and who knows what will happen or how uncomfortable she could make things. She is already starting to cause problems by purposely wanting to make other co-workers jealous by walking out arm in arm with you.
3. Reread number 1. SHE IS MARRIED! How would you feel if you were married and some guy was actively seeking to bed your wife? I highly doubt you would like it or think it was proper. So why would you do this to some other guy?