Help

I have for many years thought about watching my wife play , we have even discussed it many times. She always says that she doesn’t want other men but she loves making comments about cock size when we watch porn together. I also have gotten her to roleplay and we often use a larger vibrator during play . Her favorite thing is for me to eat her pussy while I use the vibrator and tells me how she wants me to lick her while she getting fucked by this big cock. I have given her complete control over my orgasms . I also lick her cum filled pussy when she is being extra naughty. I think it’s hot making her cum this way as it is usually much harder than just plain sex. I am just so turned on by her pleasure that I go weeks without cumming but make her cum anytime she wants . My problem is she has said it will never happen for real as she feels it’s cheating and she can’t go there. What can I say to help her understand that seeing her cum is so hot and I know she enjoys bigger at least in the fake one so I’m sure real would be unbelievable so how do I make her more warm to the idea