Fics like 404: Boundaries Not Found (Also, Hello Daddy)

When SHIELD hires a genius-level British hacker with a talent for explosions and weaponized sarcasm, Tony Stark thinks he's found a new problem to solve. Instead, he finds the one person who can out-code him, out-sass him, and accidentally steal his heart—all while calling him Daddy. Nick Fury is exasperated. The Avengers are entertained. Tony? He’s already picking out rings. “He hacked my heart. Right after he hacked my mainframe.” — Tony Stark, definitely not emotionally compromised.

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