of dreams, ice and scales (слэш)

Tony is Iron Man. He’s also a dragon who has learned that you can’t keep everything you love.
Steve is Captain America. He’s also a knight who falls into deep sleep for decades and wakes to a different world.
Together, they rescue each other.
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At nine, Tony trembles when Maria comes to him and says with hushed urgency, “Never give your scales to anyone. You’ll only regret it.”
At sixteen, Steve trembles when they lower Sarah into a hole in the ground.