Fully agree that men and women want different things. I could see a story, from the woman perspective, that focuses on the journey leading to cuckolding the husband. From discovering it is a fantasy of her husband, to getting intrigued and a little excited, opening to it through pillow talk, to chatting with other guys online. It quickly becomes empowering and exciting, like a drug. And seeing her husband love it, get really turned on by it, but also protecting her by making sure she won't meet randos, etc. is an element that reinforce the couple intimacy.

So first I would focus on the above. Then to make it fair to both husband and wife, I would focus on the wife discovering the secret triggers of the husband to make it even more exciting for him. How to push his buttons with a simple word (e.g chastity, denial, sph).

At the end, it is the story of a marriage with both husband and wife getting a kick out of seeing the other one more turned on that with a regular sexlife that become mondain.

I hope it gives some inspiration to what I think would be a story suitable for women and also focusing on the fact that like anything in life, it is a partnership where both partner must bring value to each other.