Ok, so while I get wanting to explore what Sam had done while possessed is very intriguing I find it a little disturbing that you paid no attention at all to the timeline of the episode...Sam was missing during the time he was possessed and would not have ended up naked next to his brother in bed...And while I understand that such an outcome may be entertaining for some I personally found it bordered a little too closely on Wincest...At least you left it to the imagination as to how they ended up there...
All in all, it was pretty well written so you definitely show promise as a writer but if you are tagging an episode and using that as your basis for your story you can't just change the timeline to fit your theory.
But again well written keep it up...