This fic has such an interesting way of unfolding the story with different timelines, and I think the structure worked well. I loved learning more about Snape and Harry's lives with each new snippet I was able to glimpse, whether in past or present. Gus was adorable, and there were some truly angsty moments at the beginning the reunion five years after Severus disappeared.
The plot line about the Carrows was very original, and a very nice use of your prompt. I'm glad Severus was able to draw upon his love to bind Luceferatu in the end!