It might be fun to revisit this story in a year or so, both story-wise and actual time wise; as in have the guys gotten so used to owing a sexy teen that they can't imagine not owning one going forward? Does Beth become so dependent on this illicit income stream that she can't live without it, literally? Do the cops question the guys looking for a missing teen swimmer a few days later, and does one or more of them perjure themselves into a legal trap, should my alter-ego be released at some point in the future? Or, do the guys do something inadvertently that makes it impossible for them to release their "captive" as they maybe intended at some point into the future?
Imagine if Beth were questioned by the cops as well, and the safest way going forward for all the participants, excluding my alter-ego, was for the missing teen to remain missing, sold off to some new "friends" maybe, or just kept someplace remote and shared. So many possibilities going forward, from playful "lets pretend I'm your bound sex slave for a bit" to something truly a bit darker, even if such wasn't their true intention getting into this initially.
Here's a thought, since I know first hand how teen girls can be with each other, what if Beth found something while snooping and searching my alter-ego's phone that caused her to become furious with her "good" friend, so much so that she now thought it fitting to dump her into the guy's arms permanently? If so, she'd likely tell the guys that they now have a new deal in regards to their captive, as in "do whatever you like with her, no limits!" Not exactly romantic and fun, but what if Beth found a nice young man on the rebound once at college, and wanted to put this past girlfriend-thing behind her, forget the "mistake" she had made once?
I have to ask Feline, if you were the Beth character, what would you do? As in do you think you could write the continuation to this one, from Beth's perspective? It might be fun, and this way it's conclusion could be anything you might like, from happily ever after, to "glad to be rid of her in exchange for the free education; I think I might prefer boys anyway."
Please let me know if you're interested in doing this, as I think the product could be a unique and fun read, Jackie.