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Steve and Darcy manage to keep their relationship under wraps for a while. They each have a secret-keeper they can talk to: Steve’s is Sam and Darcy’s is Thor (not Jane, Thor is much more subtle and Darcy knows it). But one of Steve’s missions takes that bit longer than either of them are used to and when he gets back he goes straight to Darcy, kind of forgetting to check who’s looking. He blows past Tony in the corridor without even noticing. Only Tony’s Dad Radar has been getting more and more fine-tuned ever since Darcy moved into the Tower and something about Steve just sets it right off. He find them cuddling on the sofa, Darcy in Steve’s lap and running her fingers through the scratchy beard Steve came back with.
When Steve buries his face in Darcy’s hair, Tony has to take a deep breath and call Pepper in the middle of a board meeting, "Pep? What do you know about giving scary father-boyfriend talks?"