For some reason, I've had the following scenarios running through my head the past couple of days and I think I may actually have to play them out to get them out of my system.Final Fantasy X: Yuna/Seymour:
Yuna's friends fail in their rescue attempt and she is forced to marry Maester Seymour Guado. He spares her friends from death, but warns Yuna that if he should ever feel she is unfaithful to him, or try to leave him, he won't hesitate to have them killed. The newlyweds depart for their honeymoon, while Tidus and the others are locked away in the Via Purifico. Over the course of their honeymoon Seymour's true nature is revealed to Yuna, through his actions and the way he treats her.(Note: Seymour wouldn't have to be outwardly cruel, as this would ultimately jeopardize his end goal of using Yuna in order to become Sin, he would merely need to seem cold, distant and somewhat disinterested in Yuna and her wants and needs.) Final Fantasy X: Yuna/Tidus:Yuna's friends succeed in rescuing her from Maester Seymour. The incident causes the two of them to fully realize their love for one another and once they are safely away from Bevelle they spend the night together. Tidus seems to be everything Yuna dreamed of having in a partner and after the first night they spent together she seeks him out. Tidus, emboldened by Yuna's love for and acceptance of his coaxes her into indulging him in a few of his secret fetishes. (Note: For this one I specifically had in mind Yuna to be in light bondage and dom/sub play with Tidus being the dom. I'm willing to add other fetishes though, just ask.)
I'm also open to suggestions for scenarios from Final Fantasy 4, 7, X-2 and any sequels to FF7, including the prequel Crisis Core: FFVII.
I'd be willing to attempt a scenario from any of the other Final Fantasy games, but cannot promise I would do a good job of staying in-character as I'm not yet familiar with many of the other games in the series.