This is utterly gorgeous. I was hesitant because I was afraid it would end in tragedy, but I am so glad I continued reading despite my fears. I got so excited when I recognised the similar sub-headings for the different parts like those in The Time Traveler's Wife, because I love the concept of involuntary time traveling.
I love how the trigger for Harry's return to the linear timeline is due to the fact that he tries to tell Snape the truth. Vocally, via Pensive, via memory, I love how all of them failed so beautifully. I especially love how Severus got the memory vial in the form of dust and broken glass. And when Harry found a Muggle way, it really broke my heart that he couldn't give it to Severus, that his chance of saving Severus was snatched right before his eyes.
I love how Harry and Ginny's relationship ended amiably, how they remained friends.
I love Harry and Severus' interactions, that they managed to share so much together in the little time they had. They had an immediate connection, and they couldn't let it go. I love that Harry met Severus at a time when Severus was less guarded, enabling them to form a relationship. You kept very true to the characters, and it is such a brilliant read.
This is an absolutely amazing story. I love all the details in it, all the relationships, all the developments. I love it in the end when Dumbledore warned Severus in his own way, and that they all had their own happy endings. AWESOME.