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The hammer slams into his waiting palm and it feels exactly like and unlike anything he expected.
Steve spins it, the motion coming naturally - he's seen Thor do it so often - and Mjölnir sings. He swings it, the weight of the hammer feeling intimately familiar, and with each hit, electricity crackles up his spine. The smell of ozone saturates the air and Steve can feel a vast thunderstorm nearby, calling to him - Thor he realizes with wonder.
It's without conscious thought that he raises his arm to the sky and Thor's presence thrums through him as lightning comes crashing down.