Shadow of the Blackbird (слэш)

It wasn't intended to prompt the reaction he gets. He hasn't counted on Russo leaning into his touch, turning his face into his palm. Least of all he's anticipated his eyes, huge and hungry they stare up at him and it strikes a cord. The wrong kind of cord but Frank can't help it, what's done is done, it's like flipping a switch.
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flashback to Afghanistan; first sexual encounter