MI6 · Diamond Protocol · DAVINT
Duty orDevotion
A Task Force 141 story.
Summer "Honey" Castellano.
Captain John Price.
The deal they both already made —
in different pockets.
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I don't fight
my nature —
I weaponize it.
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Diamond Protocol
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Duty or Devotion
The story. Dual journals. Two people paying a cost they stopped talking about a long time ago.
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Full chapter timeline. New entries marked in red. Always in order. Always growing.
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Sunny Bee
Writer · Illustrator · Creator
"I enjoy being a girl" — & the joy of creating them. From world-building and drawing to writing and everything in between—if I can get my hands on a medium, I'm using it. I'm just here to have fun!
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MI6 — Diamond Protocol — DAVINT
Duty or Devotion
A Diamond Protocol Story  ✦  Update Log
✦  Price × Summer  ✦
Price POV
Summer POV
Dual POV
Ensemble
New Entry
001The Voice Through The Wall
PriceDay Two — 0523 hrs
East corridor. 0510. A voice through the wall. Price stops walking.
002The Mark
PriceWeek One — 0630 hrs
A red kiss mark on the office door. No note. No explanation.
003At Last
DualThe Gala — 0137 hrs
Black tie. Honey takes the stage. She finds his eyes.
004Carbon and Glass
DualPost-Extraction — 0235 hrs
Third floor. A child in the wreckage. Summer breaks formation.
005The Compact
SummerSeveral Days After — 1847 hrs
The debrief room. A compact mirror angled wrong.
006The Quiet at the Bottom
DualLake Windermere — 0214 hrs
4°C water. A cigar ember on the dock.
007The Secret Entry
PricePost-Lake — 0412 hrs
He is not going to write about what happened.
008The Diamonds
Ensemble0547 Distress Call — 0641 hrs
Ruby. Svetlana. Lin Mei. The sisters arrive.
009The Cross and the Desk
DualMorning After — 1347 hrs
She came to retrieve her necklace.
010Before 0600
PriceQuarters — 0317 hrs
He wakes at 0317. Twenty-three years of noise went quiet.
Diamond Protocol — DAVINT · Chapter 001
The Voice Through The Wall
❧ Price POVDay Two — 0523 hrs

Nothing happened. Operationally speaking, nothing happened at all.

Except I'm sitting at my desk at 0523 and I'm writing it down anyway. So something happened.

East corridor. 0510. I was maybe ten metres from the briefing room door when I heard it — a voice through the wall. Muffled enough that I could hear it was singing and clearly enough to know it was her.

"There is no seam. The warmth is real."

She wasn't performing. That's the thing I keep coming back to.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 002
The Mark
❧ Price POVWeek One — 0630 hrs

I've commanded a lot of difficult people. I know how to handle difficult.

I'm less certain I know how to handle this.

At 0615 on day four I approached my office door and stopped. At eye level — my eye level, specifically — was a single red kiss mark. Pressed into the painted metal of the door with precision. Clean edges. Full lip print. No note. No explanation. Nothing else.

"I was here. I chose this. Try to move me."

I have not removed the mark from the door. I should have.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 003
At Last
❧ Dual POVThe Gala — 0137 hrs

Black tie operation. Two hundred people in the room.

She took the stage. He was at the back, where the light didn't reach. The kind of place a man goes when he doesn't want to be seen watching.

"Across two hundred people, she found his eyes and held them."

Neither of them looked away first.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 004
Carbon and Glass
❧ Dual POVPost-Extraction — 0235 hrs

Third floor. The building wasn't clear. She knew that.

She went in anyway. There was a child in the wreckage.

"She broke formation. Price watched something he couldn't unfeel."

Neither of them put it in the debrief report.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 005
The Compact
❧ Summer POVSeveral Days After — 1847 hrs

The debrief room. Standard issue table, standard issue chairs, the particular fluorescent silence of a room that has heard too many reports and not enough truth.

She had her compact mirror angled wrong. Not by accident.

"She watched him watching her. He didn't know she could see him."

The question was whether he'd figured out she knew.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 006
The Quiet at the Bottom
❧ Dual POVLake Windermere — 0214 hrs

4°C. Lake Windermere. 0200 hours and a cigar ember on the dock.

She was already in the water when he found her. Standing. Not swimming. Just standing in the cold like it was something she needed to feel.

"I needed something that wasn't a lie, Captain. The water is the only thing that's quiet."

He stepped forward. Unzipped his tactical jacket. The code was never designed for this.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 007
The Secret Entry
❧ Price POVPost-Lake — 0412 hrs

He is not going to write about what happened at the lake.

He writes about the cross on his desk instead. The gold one she left when she came to retrieve it and then didn't. He's been looking at it for three days.

"He knows exactly what it means that she left it there. He's not writing that down either."

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 008
The Diamonds
❧ Ensemble0547 Distress Call — 0641 hrs

Ruby arrived first. Then Svetlana. Then Lin Mei, who said nothing and saw everything.

The sisters. Task Force 141 had no protocol for this.

"Three women walked onto the base and the temperature in every room changed."

Summer watched from the doorway. Her past had just introduced itself to her present.

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 009
The Cross and the Desk
❧ Dual POVMorning After — 1347 hrs

She came to retrieve her necklace. That was the reason she gave herself.

It was still on his desk. He hadn't moved it. That was the answer to a question she hadn't asked out loud.

"Twenty years of correct answers making room, finally, for the true one."

Read the Full Chapter on AO3 ↗
Diamond Protocol — DAVINT · Chapter 010
Before 0600
❧ Price POVQuarters — 0317 hrs

He wakes at 0317. Her hair across his shoulder. The room is dark and entirely still.

He has been a soldier for twenty-three years. He knows what it costs to want something you can't secure a perimeter around.

"Twenty-three years of noise. And then this. Quiet."

He doesn't move. He stays exactly where he is and lets himself have it.

Read the Full Chapter on AO3 ↗
Summer Castellano — front Summer Castellano — side
◈ HONEY · PEARL ◈ ACTIVE
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Diamond Four · Pearl / Honey
Summer Castellano
"The Heart" · Honeypot Specialist & High-Angle Sharpshooter
Age
28
Born
May 12, 1998
Nationality
American — Las Vegas
Height
5'6"
Build
Curvy, hourglass
Hair
Chestnut brown
Eyes
Light blue
Personality
ENFP-T
Recruited
2022, age 22
"I use every tool in my arsenal, darling. I don't fight my nature — I weaponize it."
Background

Summer grew up in Las Vegas in an Italian-American household with deep but peripheral mob ties. Her mother Lucia died of cancer when Summer was twelve. Her father Marco — a low-level Sicilian mob associate — was killed when she was sixteen. Rather than accept her aunt's plan to marry her off to an older associate, she ran.

She started as a cocktail waitress at sixteen using a fake ID. By nineteen she was headlining at high-end venues under the names "Pearl" and "Honey B.," earning upwards of $10,000 per performance. In 2022, Russian arms dealer Viktor Kozlov became obsessed with her. David Chen extracted Summer from Las Vegas twenty-four hours before Kozlov's men arrived. She left with a golden pearl and a suitcase.

Specialisations
Social Infiltration
Precision Marksmanship
Psychological Interrogation
Performance & Disguise
Languages — EN/IT/ES/FR/RU
Psychological Profile
Strengths
Natural leader — brings people together emotionally
Deeply empathetic
Charismatic — feels entirely genuine
Highly adaptable on mission
Optimistic under pressure
Weaknesses
Absorbs others' emotional pain as her own
Self-worth tied to usefulness
Anxiety when separated from loved ones
Hyper-domesticity post-Kozlov
Extremely stubborn — will not be moved once decided
Self-absorbed — borderline narcissistic tendencies
Prone to insubordination
Respects skill, not rank
Trauma ResponseFawn — people-pleasing and caretaking as primary defence. Post-Kozlov, compulsive caretaking.
TherapyIntensive ongoing — post-kidnapping PTSD, sexual trauma processing, healthy boundaries.
Key Relationships
Captain Price
He is her person. He grounds her when anxiety takes hold. She is the reason he smiles — his team finds this quietly astonishing. Cohabitating in Diamond Wing. Marriage is a matter of when, not if.
Ruby
Little sister dynamic. Ruby calls her Principessa. Summer calls her La Mia Guerriera. They spar, cook, and keep each other whole.
Sapphire
Logic and emotion in productive tension. Summer helps Sapphire experience things rather than categorise them. Their wine nights are when Svetlana does most of her genuine talking.
Emerald
Lin Mei speaks more words to Summer in private than to almost anyone else alive. They garden together, drink tea together, sit in comfortable silence.
David Chen
"You're not just an operative. You're my daughter. The heart of this family. Never forget that."
Notable Operations
Operation Champagne & Secrets (2022)
Monaco gala — extracted intelligence from three targets in one evening while maintaining cover.
Operation Gilded Cage (2022)
Seduced an international weapons dealer, extracted financial records, testified at international tribunal.
Operation Honeytrap (2023)
Infiltrated an arms dealer's network. Intelligence accuracy: 98%.
Operation Overwatch (2023)
Sniper overwatch — 6 targets neutralised, zero missed shots.
Operation Nightfall (2023)
Survived four days of captivity at Kozlov's estate and provided intelligence during rescue.
The Kozlov Incident

In early 2023, Summer was lured into a trap and taken by Viktor Kozlov. She was held for four days in a gilded cage at his private estate — subjected to psychological torture, forced performance, and non-consensual physical contact. She was not sexually assaulted.

The rescue was a joint operation led by Captain Price. Kozlov was captured. The security breach was traced to compromised intelligence — her identity as Pearl had been obtained before the operation began. Following threat assessment, David Chen authorised her temporary reassignment to Task Force 141 under the codename Honey. The reassignment lasted six months and changed everything.

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Diamond One · Ruby · Hammer
Roisin O'Connor
"The Warrior" · CQC Specialist & Breach Expert
Age
26
Born
March 15, 2000
Nationality
Irish — Dublin
Height
5'7"
Build
Athletic, muscular
Hair
Natural auburn red
Eyes
Green — intense
Personality
ESTP
Fight Record
37W — 0L
"Found her counting her winnings in a London underground fight club. She'd just broken a man's ribs but stopped before killing him. Control in the midst of rage. That's rare. — David Chen"
Background

Ruby's father — an IRA affiliate — died in a British prison when she was eight. Her mother died of an overdose when Ruby was fourteen. She ran from foster care at sixteen and survived on the streets of Dublin, finding her way into the underground bare-knuckle fighting circuit — 37 wins, 0 losses across London, Belfast, Manchester, and Glasgow.

At twenty-one she killed a human trafficker in unambiguous self-defence. The incident flagged her to MI6. David Chen left a ruby worth £60,000 and a handwritten note directing her to St. James's Park. She arrived exactly on time. She accepted immediately.

Specialisations
CQC — Master Level
Interrogation — Physical & Psychological
Breach & Assault Tactics
Real-Time Body Language Reading
Languages — EN/Irish Gaelic/Basic RU
Psychological Profile
Strengths
Fearless in combat
Fiercely loyal — natural protector
Rapid decision-maker under pressure
Channels rage into tactical advantage
Weaknesses
Struggles with authority outside Diamond chain
Acts before thinking in non-combat contexts
Difficulty expressing emotions beyond anger
Deep abandonment issues
Trauma ResponseFight — literally and immediately.
TherapyRegular sessions — anger management and childhood PTSD.
Key Relationships
Summer
Protective older-sister energy toward Summer. Keeps her grounded. Summer calls her La Mia Guerriera — My Warrior. Ruby calls her Principessa.
Soap MacTavish
He is the first person who has ever made her laugh until she cries. She is the first person who has made him stop and think before acting. Chaos meets chaos — somehow it balances.
Sapphire
Fire and ice. Initially antagonistic. Now perfectly balanced — they debate for entertainment. "Fire melts ice." / "Ice tempers fire."
Emerald
Mutual respect between fighters. Train together daily. Communicate almost entirely in nods and eye contact during operations.
David Chen
"You saved me when I was ready to die in a cage. I owe you everything."
Notable Operations
Operation Red Dawn (2022)
Solo infiltration of a Russian arms deal. Neutralised 8 hostiles in 4 minutes using CQC only.
Operation Nightfall (2023)
Led assault team in Pearl's rescue from Kozlov's estate. Personally threw Kozlov into his own golden cage.
Operation Crimson Exfil (2022)
Extracted a wounded teammate under heavy pursuit, carrying them 2 miles on foot. Received formal commendation.
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Diamond Two · Sapphire · Cipher
Svetlana Volkov
"The Architect" · Cyber Warfare & Intelligence Analysis
Age
27
Born
November 8, 1998
Nationality
Russian — St. Petersburg
Height
5'9"
Build
Slender, ballerina's posture
Hair
Platinum blonde
Eyes
Ice blue — analytical
Personality
INTJ
Languages
7 fluent
"You saw a genius where others saw a prostitute. I owe you my dignity." — Svetlana to David Chen
Background

Svetlana grew up inside the gilded world of Russian oligarchy. Her father, arms dealer Dmitri Volkov, was assassinated when she was eighteen — the Russian government seized the family fortune within forty-eight hours. With nothing and no one, she entered high-end escort work in St. Petersburg — using every engagement as an intelligence operation, self-teaching hacking, cryptography, and social engineering.

She hacked the Russian Defence Ministry at nineteen. MI6 flagged her. David Chen reached her before Russian intelligence could eliminate her. She arrived at the designated café with the sapphire he'd left and a list of prepared questions. She negotiated terms before accepting. She has always understood her own value.

Specialisations
Cyber Warfare — Elite Hacker
Intelligence Analysis & Pattern Recognition
Social Engineering
Signals Intelligence (SIGINT)
Languages — RU/EN/FR/DE/ZH + more
Psychological Profile
Strengths
Strategic genius — plans ten steps ahead
Exceptional emotional control
Photographic memory
Perfect poker face — genuinely unreadable
Acquires new skills at exceptional rate
Weaknesses
Struggles with emotional intimacy
Overthinks social interactions
Difficulty trusting — assumes ulterior motives
Perfectionist — harsh on self and others
Trauma ResponseIntellectualisation — analyses trauma rather than processing it emotionally.
TherapyRegular sessions — emotional regulation, intimacy, and learning to experience rather than assess.
Key Relationships
Summer
Summer helps Sapphire experience things rather than categorise them. Sapphire helps Summer think strategically. Complementary in precisely the right way.
Gaz Garrick
He is patient where she is rigid, warm where she is cool. He is teaching her that emotions are not obstacles. She has calculated their long-term success at 87.3%. He said that was good enough for him.
Ruby
Ruby drags her out of her head and into the present. Sapphire reins in Ruby's impulsiveness with analysis. They argue for entertainment — it has become affectionate.
Emerald
Mutual appreciation for silence and precision. They can share a room for hours without speaking. Both find this comfortable.
David Chen
Respects his intellect — one of very few who genuinely challenges her mentally. They play chess weekly. He has won twice in four years.
Notable Operations
Operation Digital Ghost (2020)
Hacked a Russian oligarch's private network. Extracted 10TB of classified data with zero detection.
Operation Blackout (2021)
Disabled an entire city power grid during a hostile extraction. Zero casualties.
Operation Nightfall (2023)
Disabled all security systems at Kozlov's estate, guided the rescue team through every blind spot.
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Diamond Three · Emerald · Viper
Lin Mei Chen
"The Shadow" · Assassination & Silent Infiltration
Age
24
Born
April 3, 2002
Nationality
Chinese — Hong Kong
Height
5'2"
Build
Petite — deceptively fragile
Hair
Black, long
Eyes
Dark brown — unreadable
Personality
ISTP
Appearance
Delicate. Is not.
"You gave me freedom. I gave you loyalty. Forever." — Lin Mei to David Chen
Background

Lin Mei has no memory of life before age six. Orphaned and sold to a Hong Kong Triad organisation in 2008, she was raised not as a child but as a weapon. Over twelve years of training — from age six to eighteen — she became one of the most effective close-quarters killers in the Triad's network. Her first confirmed kill was at age nine, forced and traumatic.

At eighteen, ordered on a suicide mission, she killed her handler and fled to Bangkok. David Chen found her in an abandoned building — injured, starving, and still lethal enough to have a knife to his throat within two seconds. He came unarmed. He spoke to her in Cantonese. He offered protection, training, freedom to choose her targets, and a family. She took his outstretched hand. They left Bangkok that same night.

Specialisations
Silent Assassination — Close Quarters
Ghost Infiltration — No Trace
CQC — Multiple Martial Arts, Master
Poison & Pharmacology
Micro-Expression Reading
Psychological Profile
Strengths
Extraordinary calm under pressure
Efficient to the point of artistry
Highly adaptable — improvises effortlessly
Observes everything, forgets nothing
Total loyalty once trust is earned
Weaknesses
Extreme difficulty expressing emotion
Trusts almost no one — finely tuned survival
Recurrent nightmares
Dissociates under extreme stress
Struggles with physical affection
Trauma ResponseFreeze, then fight — assesses before acting, but the action is decisive.
TherapyRegular sessions — complex PTSD from childhood captivity and moral injury from forced kills.
Key Relationships
Summer
Summer's warmth is non-threatening in a way most people's isn't. Lin Mei speaks more words to Summer in private than to almost anyone else alive. They garden together, drink tea together, exist without needing to perform anything.
Ghost (Simon Riley)
Two people who understand darkness without needing to explain it. They do not fix each other. They accept each other. Healing — quietly, slowly, together.
Ruby
Ruby taught her it is acceptable to be angry. Lin Mei taught Ruby that silence can be a form of strength. They train together daily and communicate in nods and eye contact no one else can decode.
Sapphire
Mutual understanding of silence. They share rooms for hours without speaking and find it entirely comfortable.
David Chen
The first person to treat her as a human being. "You gave me freedom. I gave you loyalty. Forever." He speaks to her in Cantonese when they're alone — the language she first trusted him in.
Notable Operations
Operation Silent Night (2021)
Eliminated 5 targets in a guarded compound without triggering a single alarm. Zero trace left behind.
Operation Viper Strike (2022)
Infiltrated an enemy base as service staff. Poisoned 12 hostile commanders and walked out undetected.
Operation Nightfall (2023)
Appeared behind Kozlov with a blade to his throat, securing the target during Pearl's rescue.
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The Jeweler · Program Director
David Chen
Former MI6 · Founder, Diamond Protocol
Age
58
Born
1968, Hong Kong
Nationality
British-Chinese
MI6 Service
1990–2015
Program Founded
2016
Operations
47 — 100% success
"I couldn't save my own daughter. But I can save them. I can give them what Lily never got: a chance to fight back."
Background

David was born in Hong Kong during British rule. His father, a Hong Kong Police officer, was killed in Triad violence in 1980. His mother died of cancer in 1995. Recruited by MI6 at twenty-two, he spent twenty-five years running assets and building networks across Hong Kong, Moscow, Beijing, Berlin, and Damascus.

In 2014, his wife Jennifer and their sixteen-year-old daughter Lily were killed in a terrorist attack in London while he was on assignment. He retired from field work the following year and redirected everything into Diamond Protocol, approved and funded by a small circle of MI6 leadership in 2016.

His Diamonds
Summer (Pearl)
"She reminds him of Lily — hopeful, kind, believing in beauty even when the world offers very little. He approved Price because Price saved her when David couldn't reach her."
Ruby
"She was going to die in a fighting cage and she'd made peace with it. He gave her something worth fighting for."
Sapphire
"His mirror — analytical, brilliant, powerful. Their chess games are the closest either of them comes to vulnerability."
Emerald
"His quietest daughter. He speaks to her in Cantonese when they're alone. It's the language she first trusted him in."
Relationships — Task Force 141
Captain Price
"Protect her, or we stop being friends." Respects him as an equal. United in the singular goal of protecting Summer.
Soap MacTavish
"Be the exception. Don't make her right about men." Approved when he watched Soap make Ruby laugh until she couldn't breathe.
Gaz Garrick
"She'll analyse your relationship like a mission. Don't make her feel broken for being different." Trusts his patience above everything.
Ghost
"Lin Mei trusts almost no one. You're one of the few. Don't betray that." Recognises a damaged soul.