Mending Broken Timelines

Sorta Sequel to "Time Travel: What a Pain!" but it is not necessary to read both for understanding of either. When Sirius and Esmeralda Black's twins, Regulus and Narcissa, are overcome with grief facing their holiday trip home, a few surprising guests appear to try and alleviate their problems - not that these guests know it yet. SiriusXOC RemusXTonks Jily Marauders meet Next Gen