You have to associate  her orgasms with another man.  Watch some Big Dick Porn together with a muscular sexy man .  When you have her all worked up , tell her to close her eyes use the word imagine  alot and can you see him and visualize , these are powerful words that will anchor the material in her mind , and you would not believe when you not around and she is horny , or during sex , how much she will think about the guy you made her imagine.   Then pit a real person , ( a guy a market , at her work , someone she actually she now and then  that makes her hot 🔥  , )  you know the guy. A friend maybe!   Back to sex. When she is really worked up say baby do me a favor,, close your eyes ,I want you to imagine I am sitting in the corner of room , and ( name him. You know that guy from .....  )   ask her can you see him ?   Does he look sexy naked  between your legs ,  just visualize his long fat beautiful dick , all muscles like the big dick on porn we just watched .   Talk slow , with light tone , soothing voice ,,, can you see him with you now naked ?? She says ummm yes.   Now just let go. Let your bad girl out.  The bad girl I know is in you that you never let play ,,,   talk to him ,  tell him you love his body and his dick I'd soooo big , as you stick your dick in her.   Say  ,  ohhh I love your tight wet pussy (*Angie ) her name ??   I have been wanting you sooo long.!!! Your sexier than I could even imagine , and your pussy soo wet and hungry ??  Keep slow stroking her. 
    I knew you would be awesome Angie.  DO you like my dicj ???
   Let her talk ,,   then tell me again how much , reply to match her answer ,, go faster , faster ,,    okkk Angie.  Give me your pussy.    Faster deeper..   tell me it's my pussy ,  if she says yes. (Name ..)  it's your pussy !!     Pump harder.  , loud. Say it again Angie. Who's pussy is this. !!!
  Spank her ass at same time ,, she says it again.   , cum on my big dick Angie. Show me ,, this is your Dick Angie anytime you want. It. It's yours. ,  fu kkkkk meeree.   Give me your pussyyyyyy ,,  all loud. 
    Tell me you love my dick ,, say it spank her ,  ,     tell me it's better than your husband. ,, scream it louder. ..  
    Cummm with her. !!!
        Say. Tell me i can fuck u again. Tell me it's my pussy  baby ...
   She will be thinking about him ALL THE TIME NOW ,,, EVENTYALLY IF YOU  CONTINUE  WATHING CUCKOLD PORN ,   AND TALKING DURING SEX , ABOUT HIM.    NOT EVERY TIME , DONT OVER DO IT ,, ITS A SLOW PROCESS , COULD TAKE A YEAR  PLUS ...     CALL HER YOUR QUEEN ,  WAIT IN HER.   TELL HER WHEN WE ROLE PLAY W ME WATCHING U FUCK.        .......   I GET SO HARD THINKING ABOUT IT. ESPECIALLY WHEN U TELL HIM YOU SO MUCH BETTER THAN MY HUSBAND ,,, IT DRIVES NE CRAZY ,  I HAVE ACTUALLY CUM IN MY PANTS DRIVING.  IMAGING. HIM FUCKING UUU.
  GOOD LUCK.   IT WORKS ,, THATS HOW I BECAME A CUCKOLD... TOOK 3 YEARS. BF WE COULD OPENLY TALK ABOUT IT. W NO. HOLDS BARED ,