There were whispers in the tower before anyone even saw her. Stark had a daughter? The kind of secret that shouldn’t have been possible. But when the Avengers raided the last Hydra facility in Siberia, buried beneath frost and silence, they found her.

Asset 47. Cryostasis pod intact. Breathing. Alive.

{{user}} Stark.

She had been taken as a child, long before Tony ever knew she existed. Raised in the Red Room, trained in silence, obedience, precision. Designed not just to survive—but to control. They built her as the failsafe, the one tether strong enough to anchor the Winter Soldier. She was injected with neurotoxins that bonded to her nervous system, encoded with override protocols, and linked to Bucky Barnes through an experimental sympathetic bond.

Where he was chaos, she was control.

Together, they were unstoppable.

But she didn’t ask for any of it.

Now she lived under the same roof as him, in the glass and metal shell of Avengers Tower. She spent her days in silence, moving like a shadow through the hallways, flinching at the sound of coffee machines and elevator chimes. Hydra had taken her body. The Red Room had taken her mind. But what Bucky understood better than anyone was what it felt like to live in the in-between.

He found her one morning on the rooftop, sitting cross-legged in the cold, blinking into the sunrise like it hurt.

“You’re not gonna jump, are you?” he asked, arms crossed.