A external relationship is always calling for disaster when SEX is not the only motive. I would stay away from her and masturbate. Better spend on your wife or good GF she will give you better service for sure. Later these can go in to blackmails and threatens. A gold digger is a disaster , she not there for SEX but for money. Many crimes roots from such relationship.
I have relationships outside with some old MILF , we meet like in 6 months once and fuck like dogs. We never talk about money , her husband , my wife. , we respect each other... i do pay hotel rents and other things but i see also brings some home made food and we have gala time. I have been sleeping with widows who have so much monetary issues but they spend time to relax and not for money.
SEX lasts for 2 hours but GREED for years.