Under Regulation || Sgt Sullivan x Y/N(Female Reader)

They enlisted together.

Same day. Same office. Same nervous jokes that slowly died the closer they got to the yellow footprints. L/N, Cope, and McCaffey-three names about to be stripped down into uniforms, numbers, and expectations they didn't fully understand yet.

Boot camp wasn't about who you were before.
It was about who survived after.

L/N knew that going in. She wasn't naive. She didn't expect it to be easy and she definitely didn't expect it to be fair. What she didn't expect was how much distance could exist between people standing only a few yards apart-or how silence could feel heavier than shouting.

Sgt. Sullivan was never meant to matter to her.

He was a Drill Instructor for the male platoons. Untouchable. Unreachable. A presence she'd only glimpse across training grounds or hear echoed through the chaos of someone else getting corrected. He was regulation, discipline, control. A line clearly drawn.

And she was just a recruit.

But boot camp had a way of crossing paths that weren't supposed to cross.
Of testing rules as much as it tested bodies.
Of forcing people to feel things they had no right to act on.

This wasn't a love story that started with choice.
It started with proximity.
With restraint.
With everything unsaid.

And somewhere between Guam memories, breaking recruits, and becoming Marines-

Lines began to blur.

DISCLAIMER: This is an ongoing AU fanfiction. Sullivan's sexuality is not explicitly defined and may evolve as the story continues, as I'm still deciding the direction of his character arc.

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