I'm sorry for the delay in commenting but Bascon ate my brain this weekend. This made wonderful bedtime reading, btw.
I love the time turner and that the accident which de-ages Severus is completely accidental and ordinary and muggle-based. The shards of time turner, and the seizures and the slow growth of their relationship as Severus ages is wonderful. Also the way that Lily's love and Severus' original vow morphs the bond.
And, honestly, I could keep going, but...
Thank you so very much. This was wonderful and met so many of kinks.