Thank you, that's a wonderful compliment. I must say that I love the way you write, I get "into" meaning inside your characters, and I enjoy vicariously what they are doing.
I love the concept of getting dumped off someplace, it has been a theme in some of my stories, and several more that I'm working on, (on and off), that feel very erotic to me. I could envision a scenario where Tina starts off bound up in some restrictive and creative way, or perhaps just dumped off nude on the side of a desolate road through the desert by Shack. She could be wearing nothing at all, or a pair of cuffs behind her back, or whatever you thought might be fun and appropriate, but I could imagine myself being left abandoned for a time in a similar condition and left to fend for myself (helplessly).
Shack would come back and rescue her obviously, after some period of time had passed, but the sound of the dig diesel truck driving away as your left naked, cuffed and vulnerable on the side of the road would be nirvana to me. Maybe Tina would have to find her way to a nearby cave where some water was stored by Shack ahead of time, maybe even he might have to drop off his rig for some work afterwards and he then returning in a borrowed vehicle of some kind to rescue her after taking proper advantage?
It's just a little fantasy of mine, hope you like the idea, Jackie.