LF Fic

I’m looking for a fic that I remember reading. It’s obviously Harmony. What I remember is H/Hr travel back in time to prevent the deaths of James and Lily. Because of the method they use to travel back, they have a finite amount of time to convince the Potters (and maybe the Grangers?) that what they are saying is true. They then cause an explosion to decimate LV (maybe wormtail too). The rest of the fic is the two kids growing up in their young bodies, but with their memories from the previous timeline. Any help would be appreciated.