I have a fantasy to ...... a hot wife!

I don’t know is it weird but I want to ...... someone’s wife with ....... Of course they should know it and it would be our common fantasy. I want to ...... the husband and let him tie her wife to the bed with a blind fold. Wife will be unaware(just for the time, of course she should know we will do this in anytime as our common fantasy) and he will serve her to me because he is desperate. I will use his wife in-front of him and the wife probably will cry and beg to me. When I’m done with using his wife and humiliating both of them he will lick my cum from her pussy. Then I will let tell him “I will let you for the next time” . Is there anyone have this kind of fantasies? Or should I go to a doctor?
We have done this