Such a great story! It deals with all the psychological issues that Harry & Snape would have. Belonging and need with these two damaged men, and how that would play out. You handled the characters wonderfully. Albus, of course, up to machinations from beyond the grave.
When you first mentioned Snape recording audio books, I instantly thought of Rickman's recordings of Shakespeare's Sonnets. Oh what a voice!
Weaving this story with Captains Courageous added a nice depth. The time alone forced Harry and Snape to reconnect and work out some issues. And introducing a lost brother! An addition to the mystery I didn't expect. Harry's cup runneth over!