I would think about all of the ways this could go wrong before doing anything. What would happen if she wasn't interested and reported you to HR? What would happen if your coworkers found out? Or your wife? Or her husband?

My coworker dating experiences have been awful. In one situation, I eventually became the person's boss. His job was eliminated and a transfer to my department kept him employed. If the company had known we had dated, they wouldn't have permitted the transfer and he would have lost his job.

We were no longer dating, but either one of us could have been fired for violating company policy which prohibited dating between superiors/subordinates in that case. It was extremely stressful.

In another workplace, the company owner had an affair with a customer in another country. She wrote off all the travel as a business expense for ten years. When the partnership split up, the other partner informed both spouses, all employees, some customers, and the tax authorities about the affair.

Personally, I would search harder for a way to end the obsession rather than introduce more complications. Could you transfer departments? Make a list of her flaws and remind yourself of them whenever you have lustful feelings? Good luck. It's a tough situation.