Severus Snape thought he was about to be freed, but he didn't expect that he would be brought back to his childhood by Salazar Slytherin after his death. However, the condition was that he would help his only descendant. He originally thought it would be difficult to perform this task, but after accidentally meeting Voldy in Diagon Alley in advance because he had not completely lost his feelings, he found that his previous master seemed to treat him differently. What made him even more surprised was that he also...
All in all, it's a 1vs1 strong pet story, loyal dog attacking Voldy vs happy being Sif
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