This is just an idea I had. It would require you playing 2 or 3 characters to my one. My character while at a club turns down the youngest brother who'd be 18. His older brothers notice this and know their brother wanted the girl so they decide to take her.
Now, this can go one of two ways and I'd like to be surprised on how you decide to kidnap her. Either something can be slipped into her drink, or she can be snatched when she goes to leave.
They'd take her to their cabin far in the mountains (no electicity and such) and she can be abused on the ride there and taken by the younger brother as the other two encourage him to do so.
I'd like it to include, non con, obviously, but can include bondage, them breaking her spirit and other things depending on what you'd like to include.