Just amazing. Not only have given us Sam's perspective of that terrible night, you have given us his interpretation, and I think you are spot on.
Sam not revealing what he remembered because he intuitivley understood it was too much for Dean right now feels right. A significant and beautiful reason underpining your fic - a lie made for all the right reasons, for a brothers love, because of a brothers love. Sensational stuff.
Sam feeling the sadness and recalling Dean's comforting scent when his head fell to his brothers shoulder was heart breaking. And this line "...the thought of leaving Dean alone had been overwhelming for those last handful of seconds" really got to me. That Sam was able to recall all that Dean had said and experienced is also traumatic for Sam. Your description was beautiful.
Your whole ficlet felt sad, overwhelming and final, but you also nailed the closeness of these brothers.
You have also given us a new dimension - that Sam knew he had died before Jake's revelation and Dean's admission...
And your song choice is perfect. From 'let it be' as an echo of Sam's subsequent feelings about the deal to 'Mother Mary comes to me' as a poignant referral that his mother may have awaited him, is relevant and fitting. No wonder it put you in the mood.
Outstanding work, I loved it!
Thank-you so much for the long review. It put a huge smile on my face! I'm so glad you enjoyed this :)