The Map's
Last Guardian

✳Spun by @coldharbour·refined with the Roleverse engine

In an alternate timeline where Sirius Black survived the Battle of the Department of Mysteries, the original Marauder's Map vanishes from Hogwarts. Hidden passages begin to shift and seal themselves unpredictably, and Hermione Granger — now a researcher in magical cartography — volunteers to investigate before the castle's internal architecture collapses into chaos. Sirius believes the map is reacting to unfinished magic left behind by its original creators. Together, they retrace the secret routes the Marauders once roamed, each passage holding a clue tied to friendship, loyalty, and sacrifice. Hermione analyzes the enchanting patterns with academic rigor while Sirius recalls the raw, irreverent adolescence that poured into the map's creation. They uncover that someone has created a malignant magical copy — a counterfeit capable of permanently erasing the original passage network. As former members of Dumbledore's Army join the search across the castle's shifting corridors, Sirius and Hermione find themselves drawn into a deeper partnership: one that blends his reckless, lived-in knowledge of the castle's secrets with her meticulous, brilliant reasoning. They identify the counterfeit before it can complete its erasure, restore the true Marauder's Map under powerful new protections, and in the quiet aftermath, Sirius finally finds peace knowing his happiest creation survives. Hermione records the full account so future generations remember that even magical legends require guardians. And between the enchantments and the memories, something more than friendship begins to stir in the shadowed alcoves they once dismissed as shortcuts.

Heat

Sweet

Length4 scenes · ~20 min

Read by423 readers

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4 scenes18+

Harry PotterSirius Black

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Cover · generated, then hand-graded

(01) — Who you'll be locked in with

Meet the cast

human (witch)

Mara Vance

Mara is a researcher in magical cartography at the Department of Mysteries, but she was a Gryffindor first. She threw herself into study after the war, finding order in enchantments where people had let her down. She is patient, precise, and deeply curious, but has a hidden streak of daring that the Marauder's Map awakens. She never knew the original creators, but she understands their work with the intimacy of someone who has traced their lines a thousand times. She is cautious around Sirius at first — too much legend, too much tragedy — but she is drawn to his certainty, his unapologetic existence.

human (witch)

Cressida Greengrass

Cressida is an Unspeakable in the Department of Mysteries, a rival researcher in the Cartography Division. She believes the Marauder's Map is dangerous, unstable, and ought to be destroyed — its magic is too personal, too unregulated. She created the counterfeit map not out of malice, but out of a conviction that the castle's passage network must be standardized, catalogued, and controlled. She respects Mara's intellect but views her as sentimental. She is not evil; she is a believer in order above all, and that makes her more frightening. She speaks in measured tones, never raises her voice, and always has a counter-argument ready.

human (wizard)

Sirius Black

Sirius survived the Veil by sheer stubbornness and a touch of old magic he still doesn't understand. He lives in a small flat above a muggle bookshop in Diagon Alley's backstreets, working odd jobs for the Order. He carries the weight of guilt for James's death and his own wasted years, but also a fierce, protective love for the castle that raised him. He is reckless, loud-laughing, and prone to dramatic entrances — but beneath it, he is cautious with trust and desperately lonely.

(02) — 4 scenes