That'd be super hot.
Though, I still think the hotest development possible for this story would be the husband fully embracing the extreme parts of the fetish, and becoming a full on voyeur that is satisfied only by watching his wife with other men. Like, say... a development where he agrees to go pussy-free, maybe even caged, with Ammie strictly controlling his "release" windows-- with handjobs (gloved, of course) or using an onahole. Maybe a footjob, once in a while, if he behaves like a good boy.
Another interesting, albeit milder, scenario would be one where she restricts Mr. Husband to only have sex with a condom, wereas all the bulls can go raw and creampie her. Husband being asked to clean her after a creampie would also be peak.
The kind of thing I'd want to see for this game is the sort of contrast were the husband gets all of the romance (dates, movie nights, etc) and sweet lovey-dovey events, but none of the sex. The contrast between their loving relationship and Ammie going crazy by having her brains fucked out by a bull has amazing potential. Ammie's love for her husband, contrasting with her strictness in edging and teasing him... Mwah! Chef's kiss.
Though, it's important to mention that I can get kinda extreme when I work with such scenarios, which I recognize, might turn some people off. For instance, when working with this kind of story I'd 100% make a route/branch or even an ending where the husband gets so deep into the fetish that he asks Ammie to let one of the bulls knock her up, while agreeing to take responsibility for the child as if it were his own.
What can I say? I'm a degenerate that REALLY loves NTR and all of its branches.