It is definitely my fantasy also. I love being forced - either physically or psychologically. Could you perhaps ask your wife whether she means that she wants you to physically force her (grab her and use her) or if she would be more excited if you control her in other ways (mind games). I understand that she doesn't want you to role play it but if you are going to act a little out of your usual character, it will be a sort of role-play.
For example, you could tell her that you will, at some point next weekend, do as she asks (so that she is prepared for your change of behavior but doesn't know exactly when it will happen. I love the element of surprise in games which is a part of why I love the man being in control; I never know what he will do next.)
Then, next weekend, you wait for her to say or do something that you can get angry about (or if she doesn't you can set it up, like asking her if she heard you when you asked her to do x, y or z and then you get angry because of course she didn't hear you and so didn't do it.) You then walk up very close to her and with a straight face and pure anger in your eyes you say something threatening like, "Ok. That's enough. Get into the bedroom. Now." (Or get on the sofa or wherever you prefer.) If she doesn't move, grab her by the wrist and drag her there, then throw or push her onto the bed.
"Let's see if you can follow some simple instructions, shall we? You are obviously incapable of carrying out the simplest task so perhaps you need more practice. As I am a kind and generous man, I will help you. Now strip."
"That's not quick enough. You see, you cannot even follow such a simple command."
You undress her very roughly.
"Now, that's better. Let's continue, shall we? You are not move, do you understand? Not a hand or leg, not your head or your hips. You may blink and breathe, that is all. You are not to speak, scream, sigh or moan; I do not want to hear you."
You begin touching her, kissing, licking etc. When she moves or makes a sound, roll your eyes and feign anger.
"Ok, that's enough. I have had it with you. I was going to be generous, give you the benefit of the doubt, go nice and slowly and gently, but you don't deserve it."
Then flip her over and take her roughly doggy style. Or take her with a large dildo. Or do anything else quick, rough and unexpected.
I hope this gives you a few ideas, anyway! It's the sort of treatment I love, but all women are very, very different so she (or you!) may not enjoy what I describe. Have fun experimenting!!!