riverr0cks
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Summary
There are seven Millennium Prize Problems.
Seven.
Only one has been solved, and Lena's determined to be the second person to solve one of them, or more specifically, the person to solve the P versus NP problem. A certified maths genius, she's spent ten years working on solving the problem, but to her frustration she hasn't been able to crack it.
Taking on a maths fellowship at the National City Institute of Mathematics, Lena begrudging enlists the help of another maths genius to help her solve the problem, but that's only the start of Lena's problems.
- Language:
- English
- Words:
- 45,244
- Chapters:
- 16/16
- Collections:
- 4
- Comments:
- 275
- Kudos:
- 2,231
- Bookmarks:
- 328
- Hits:
- 34,570
Bookmarked by riverr0cks
23 Jun 2026
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After an experiment gone wrong, Lena wakes up the next morning in Kara's body in National City, assuming it's a dream.
Meanwhile, Kara wakes up in Lena's body in Metropolis, also thinking she's dreaming.
They begin switching bodies intermittently, not realising what's happening until the people close to them start pointing out how strange they've been acting recently.
Slowly, Kara and Lena come to terms with the fact that they're sharing bodies with a stranger in a different city. Communicating through notes and memos, they both help keep each other's life on track, trying to help each other along the way.
As they learn more about each other, they grow closer, developing a special connection. Desperately wishing they could meet, they seek each other out, but something other than distance is keeping them apart.
Based on the film Your Name.
- Language:
- English
- Words:
- 27,638
- Chapters:
- 12/12
- Collections:
- 3
- Comments:
- 318
- Kudos:
- 2,818
- Bookmarks:
- 381
- Hits:
- 39,029
Bookmarked by riverr0cks
21 Jun 2026
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Summary
Following Lex’s death Lena finds herself guardian to the four year old nephew she never knew existed. She also finds herself in need of help. Who better to help her than her best friend and National City’s favourite Kryptonian. It’s just a little awkward that her nephew is scared of Supergirl.
OR
Kara and Lena raising Lex’s son while slowly getting together with a bunch of cute fluff and some angst thrown in as they work together to be the best parents possible to a scared little boy.Canon typical violence, injury, and threats.
I promise no major character deaths, Leo is always safe, happy ending guaranteed.TW:
Child emotional abuse/neglect- I very much avoid going into detail but the effects are shown and a big part of the plot is about Leo’s recovery and anxiety
Described anxiety attacks (adult and child)Updates scheduled every five days.
- Language:
- English
- Words:
- 95,676
- Chapters:
- 16/16
- Collections:
- 7
- Comments:
- 1,844
- Kudos:
- 5,566
- Bookmarks:
- 1,094
- Hits:
- 171,561
Bookmarked by riverr0cks
07 May 2026
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this is how nia nal begins her phd in quantum physics at national city university; how she meets both her doctoral supervisor and her arch nemesis in one fell swoop and falls just a little bit in love with both of them. really, who can blame her?
- Language:
- English
- Words:
- 17,665
- Chapters:
- 1/1
- Collections:
- 2
- Comments:
- 358
- Kudos:
- 4,308
- Bookmarks:
- 969
- Hits:
- 40,411
Bookmarked by riverr0cks
20 Feb 2026
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Summary
Lena and Kara can barely be in the same room, let alone be in a relationship. But after some poor babysitting by Winn and James in the future Lena and Kara end up meeting their daughter years early and they suddenly find themselves on the same team even if it's just for a little while.
- Language:
- English
- Words:
- 13,713
- Chapters:
- 5/5
- Collections:
- 1
- Comments:
- 203
- Kudos:
- 2,091
- Bookmarks:
- 276
- Hits:
- 26,352
Bookmarked by riverr0cks
14 Jan 2026