Cuckymu,
Does she have any friends (maybe even a single friend) that she could go out with to this club? She may loosen up with a couple of libations and with you not "breathing over her shoulder". When she's "approached" by this gentleman or another, she'll definitely justify some flirting or MORE with your statements ringing in her head. The mood, music, holy water and party atmosphere will do wonders for her resolve.
You may even want to take it a BIG step further: Get this guys cell and call when she plans to revisit the club, even if it's with you. Or if there is another inocent way of letting him know when she'll be there. She just may grant your wish if he tells her that you called and told him she'd be there that night.
Two different approaches, one is certainly more forward.
If she's late getting home, DON'T call her cell! Let her call you! And don't "pounce" on her when she does arrive (she'll be experiencing confusion and mixed feelings if she did ANYTHING, even if was only allowing him to "coop a feel", kiss or hip grinding)
If she's on time or early, just simply ask if she had a good time and leave it at that. You can be a little more inquisitive the next time you're sharing fantasies in bed.
If you truly want this, and certainly sounds like you're cock gets nothing but hard when you think about it, let it come to you in pieces. Gentle nudges, NOT pushing will get you there. Enjoy!!