Fics like ain't my blood; still my boys

When Tony made an off-hand comment about adopting a child, he never expected Steve would jump on the idea so quickly. He definitely didn't expect to adopt two kids. And even if they did expect to love them dearly, they weren't ready for the fierce protectiveness that raged within them for their boys. They couldn't save them from the past, but they could protect them from the future and whatever dared to threaten their safety. Through fostering Harley and Peter, Steve and Tony learn a lot from them, who have experienced more than any child ever should. But they have something to teach the boys themselves: family doesn't end in blood. (Instant Family AU)

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