Fics like The Intern Protocol

To the rest of Avengers Tower, Casper Grey is just Tony Stark's exhausted, snarky intern desperately trying to survive college midterms and FRIDAY's thermal sensors. No one suspects that a rogue bio-serum breach during the Battle of New York fused with his shadow, granting him ancient, vault-phasing powers and an unseen army. Down in the subterranean training ring, his reluctant sparring sessions with Natasha Romanoff quickly unravel his harmless facade. Natasha sees right through the laid-back act to the lethal tactician beneath, sparking a fiercely guarded, late-night romance built on shared secrets. By day, they trade sarcastic banter and dodge public attention; after midnight, they share a reality where no shadows or secret identities are needed.

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