This was amazing. I loved seeing Severus *Hall of Regrets*, he made an interesting Gryffindor, the relationship with Lupin was a nice touch. The modified Syltherin Severus was nice to see as well especially his interactions with baby!Harry. The slightly nicer Professor Snape in the third *regret* turned out to be not such a good idea, Voldemort will always use anything and everything against Harry. I adore Albus, he's still being manipulative even in the afterlife. And what a choice/glimpse of a future with Harry, Severus would have to have been totally stupid to turn it down. The last paragraph was just beautitufl (I'm repeating it here cause I love it so much)
Opening his eyes, he found Potter staring down at him, concern mixed oddly with the growing smile on Potter's lips. Severus gave Potter's hand a squeeze and nodded, despite the remaining pain in his neck, meeting the green eyes and very nearly smiling in return with the knowledge of what lay ahead for them.