I don't know where to put this. I would put it in the plot bunny thread, but you seem willing to go with writing this already. And it's not just an announcement for a fic, because you haven't posted it yet.
I'll move this to the plot bunny thread so if you would like opinions on the plot, you can get it there.
But as a general rule, you can't post a thread in the Writer's Lounge just saying that you're going to be posting a fic soon.