Title: Vicious
Author: Jilly James
Fandom/Genre: NCIS, Sentinel Fusion
Relationship(s): Tony DiNozzo/Jethro Gibbs, Other minor pairings
Content Rating: PG-13 for warnings and language
Warnings: Allusions to canon-level violence
Author Notes: One element of the worldbuilding was inspired by the idea of a sentinel ascendant, which I read in a story by Keira Marcos. I’ve applied the idea quite differently.
Word Count: ~30k
Beta: Ladyholder
Spoilers: Takes place around season 8 of NCIS, but it’s a completely reimagined backstory, so very few episode spoilers.
Challenge: This is my entry for the 2016 NCIS Secret Santa and was written as a gift for Desertpoet. While the assignments for the Secret Santa were done by AO3’s matching system, I was delighted to be able to write this present for a good friend.
You can view the entire SeSa collection on AO3.
Summary: Tony DiNozzo was used to his life changing unexpectedly. A broken leg in college turned him in the direction of becoming a police officer, a gunshot wound that nearly crippled him brought him to forensics, and now, coming online as a guide was going to take him someplace a little vicious.


Story Links

Acronyms and Terms

SSC – Support Services Center (fictional)

Alpha – A sentinel or guide who leads a pride of other sentinels and guides
Prime – An alpha sentinel or guide who is responsible for a territory
Guide Ascendant – a guide who is capable of navigating the spirit plane, OR the guardian of a first guide, both can easily manipulate psionic energy and see psionic influences on the tangible plane.
First Guide – the first spirit guide of new species

Cast Page


Ocelot First Guide


Tony DiNozzo
Guide Ascendant

Jethro Gibbs

Maggie Matthews
Guide Ascendant

Tomas Matthews

Eric St. James
Alpha Guide Prime

Devon St. James
Alpha Sentinel Prime

Blair Sandburg
Alpha Guide Ascendant Prime

Jim Ellison
Alpha Sentinel Prime


  1. More Vicious please. She and Tony are so adorable together. Thank you for sharing. 🙂

  2. Ok this picture of Tony and Vicious is freaking adorable!.

  3. Can I ask why you deleted your stories from AO3? It’s one of the only sites and I use and I was very sad when I saw that.

    • There’s a post on my site that explains my decision to leave. It’s linked on the main page. Called Assholes, Vanity, and Straw. My stories will only be here.

  4. Fantastic!! I <3 all your stories, (especially some Tony whump 🙂
    Engaging and long enough to get your teeth into, plus well written and grammatically correct – a rare gem in a fanfiction writer!
    Keep it coming please!! Xx

  5. I love all the detail and world building in this story. You are a master storyteller.

    As someone who has been owned by a cat in the past, I find Vicious delightful.

  6. Just re-read your story Vicious. I’m totally in love with the Vicious Heathen. I am definitely looking forward to reading more about this ‘verse when you get back to it. Thank You for sharing 🙂 kontiki

  7. Just re-read for like the 20th time. So fantastic. Love Vicious.

  8. You know … I adore this story, and it’s awesome. But I just cannot take Vicious herself AT ALL seriously. Because every time I start to, there’s a picture of this adorable, innocent, fluffy kitten on the page and I go ‘ … yeah, no. Too cute to be a badass.’ and have to restrain the urge to reach through the screen and cuddle her.

    Which is probably like, half the point. Because I’m quite sure, in-story, pretty much everyone sees this … kitten … and completely discounts her as any kind of threat. Even when they’ve heard about her previous shenanigans. Because *innocent, adorable kitten*.

  9. Great story. Love Vicious. Send more soon.

  10. Can you tel! Me who the images of Eric and Devon St James are as I recognise them but can’t remember the names? Please.

  11. I am now binging on ocekitten pics…..

  12. I’ve read this story a couple of times and it’s always a pleasure. I like it so much I named my kitten Vicious Heathen, but I had to add a middle name. Ninja. Because when she’s feeling vicious, you never see her coming.

  13. Are you going to post anymore of the VIcious series

  14. I totally just feel in love with Vicious!

  15. Thank you for writing this story. Please tell me whose photo is used for Tomas. I recognize his face (and think that he is a perfect choice) but can’t figure out his name

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