Found this via spn storyfinders and I am so glad I did!
Wow.
I am in awe of this story! It is such a novel way of looking at Sam's character - it makes sense that it's possible for him to have multiple personalities to deal with his childhood/young adulthood and of course Dean loves him (and all his alters). And I love at the end that they integrated because of their shared love for Dean. Wow. Just...wow. I would love to write more but my brain is still processing the awesomeness.