You're standing at the threshold of a great opportunity. Don't let it pass...
Wannabecuck,
Your wife is exceptionally attractive; her low-cut dress and facial expression also suggest sensuality. Given developments at the party, I'd say the subsequent statement to you by the guy she was fondling was entirely reasonable.
Since your wife is obviously attracted to him and he to her, and since your adopted name and thread title indicate you want her to make you her cuckold husband, I suggest initiating plans with her active involvement to make it happen. Your wife and her soon-to-be lover have already solved the most difficult aspects of this problem for you, which are (i) her letting you know, in effect, that she wants to expand her sexual horizons, and finding a man she wants to fuck, and making it clear to him she wants that, and (ii) him recognizing your wife's desire for him and making it clear to you he wants to act on it.
His surprisingly blunt statement was actually a courtesy to you, in my opinion. He has made it possible for you to attain something many husbands with cuckold personalities plan and scheme for years to bring about. Also, you can consider it a plus that instead of initiating an affair with your wife (who, in effect, told him she wants him) behind your back, he has told you in a straightforward way that he wants to fuck her.
Since both you and your wife apparently want that too, I'd say go for it. There are uncertainties (of course), but you are standing at the threshold of an opportunity that has potential for greatly increasing your wife's sexual satisfaction, as well as your own as her faithful cuckold husband whose enlightened views have increased her happiness. Encouraging your wife to forge ahead has potential for increasing the erotic quality of your marriage for many years to come.
Best wishes to both of you—
Custer