Setting: ~1880 West Texas
Situation: Your character, the only child of a wealthy somebody (rancher, miner, railroad magnate?) has just married a man she neither knows well nor loves. Her reasons for marrying this man, like her background, are entirely up to you (pressure from her father, fear of spinsterdom, low self-esteem?). Regardless, her new husband is liked by her father and eminently respectable, and is about to take her on a lavish honeymoon that begins in San Francisco. But to get to San Francisco, the newlyweds have to take the train--and to get to the train, they have to take the stagecoach. And while taking the stagecoach, the driver stops in the middle of the desert to pick up a dusty, horseless stranger (my character).
As to what happens after that--well--I'd prefer to let it unfold during play rather than give the game away, though I'm more than happy to answer any questions put to me.
Also, a caveat: I'm more story-driven than sex-driven, so it'll likely take a good bit of story before we get to the sex part--it's just how I write. If you take a look at some of my previous posts, you'll get the idea.
That said, PM me if you're interested.