Consider your options

It seemed obvious that the answer to fuck her, but as they say, having an affair with a married woman was a slippery slope; the situation could escalate easily and more importantly beyond your control. From the way things were, if you let her off, there was a big chance she would keep quiet, and you can simply walk away scot-free. Continuing to fuck her, and the ensuing possible development ranged from nothing happen to her becoming too attached to you. The proverb 'Hell hath no fury like a woman scorned’ existed for a very good reason, one you should take heed if you value your life. A moment's pleasure certainly wouldn't be worth it if you ended up being stabbed by her.

Eventually, you come to a decision.