DiagonDuck
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Summary
A cold war between Lord Voldemort and Magical Britain has stretched on for decades. Harry Potter, Boy Who Lived, goes undercover as a low-ranking Death Eater. His goal—stay unnoticed while he gathers intel for the Order of the Phoenix.
Harry is fully unprepared when cool distance from the Dark Lord morphs into a burning obsession that threatens to strip him of all his secrets and everything he thought he knew.
But just like Voldemort, Harry is nothing if not resourceful. He always finds his way out of trouble, even if he has to run straight into it.
- Language:
- English
- Words:
- 55,213
- Chapters:
- 17/?
- Collections:
- 2
- Comments:
- 404
- Kudos:
- 638
- Bookmarks:
- 192
- Hits:
- 19,935
Bookmarked by DiagonDuck
30 Apr 2026
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nastily exhausting wizarding tests by purplestormsnail
Fandoms: Harry Potter - J. K. Rowling
14 Feb 2026
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Dumbledore surprises the student body by hiring eighteen-year-old Tom Riddle, barely out of school himself, to be the new Defense Professor.
Harry’s final year at Hogwarts is shaping up to be very interesting indeed.
Series
- Part 1 of N.E.W.T.s
- Language:
- English
- Words:
- 11,052
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 58
- Kudos:
- 695
- Bookmarks:
- 141
- Hits:
- 5,570
Bookmarked by DiagonDuck
04 Mar 2026
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Summary
Tom is a swindler. A scammer. A con artist with a long trail of miserable victims.
But then he messes with the wrong person, and now has one Harry Potter hot on his trail. Who spontaneously has decided to become a scam-baiter.
Except Harry’s aiming to take the scamming to the next level.It all spirals into mutual obsession and a twisted dance of manipulation, mind games, and seduction.
The only question remains: who’s going to come out on top?
Series
- Part 5 of ferocious_mermaid’s crackfic collection
- Language:
- English
- Words:
- 39,559
- Chapters:
- 14/14
- Collections:
- 3
- Comments:
- 362
- Kudos:
- 596
- Bookmarks:
- 164
- Hits:
- 9,359
Bookmarked by DiagonDuck
04 Mar 2026
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Caution: Dark Lord in Progress by ferocious_mermaid
Fandoms: Harry Potter - J. K. Rowling
20 Dec 2025
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Summary
To think that Tom Riddle would become less obsessed with Harry once they began a relationship was, in retrospect, a grave mistake.
Tom’s journey from entering a relationship to the ordeal of losing his virginity, as witnessed by his long-suffering knights.
This fic follows That’s Not My Name, though prior reading of it is not a must.
Series
- Part 2 of On the Matter of Tomfoolery
- Language:
- English
- Words:
- 7,882
- Chapters:
- 1/1
- Collections:
- 2
- Comments:
- 80
- Kudos:
- 869
- Bookmarks:
- 131
- Hits:
- 6,168
Bookmarked by DiagonDuck
03 Mar 2026
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Summary
After Harry gets thrown into Kings’ Cross station at limbo during the Final Battle, he faces a choice—to return to the present or go to another time. Unfortunately, not everything goes as planned when he shows up in 1943 and finds himself only able to speak Parseltongue.
As the only other student who can speak Parseltongue, Tom is assigned to be Harry’s guide throughout the remainder of the school year.
Series
- Part 2 of 1940s Tomarry time travel fics
- Language:
- English
- Words:
- 7,105
- Chapters:
- 1/1
- Collections:
- 8
- Comments:
- 110
- Kudos:
- 4,266
- Bookmarks:
- 724
- Hits:
- 40,530
Bookmarked by DiagonDuck
20 Feb 2026