History Repleating (Or the Proper Care and Feeding of One Steven Grant Rogers) (слэш)

"And what did you make of Dr. Smartypants? Quite a way with words, don't you think?"
"He's something," Steve hedged. "Was hoping you could shed some light."
"Where would be the fun in that?" Natasha chuckled. "Have I ever sent you on a wild goose chase?"
He sighed again, heavily. "No."
"Have I ever failed to have your back?"
Steve grunted at the irony. She'd been assigned to his detail just after he'd thawed out. The word he'd use to describe that time would be 'suffocating'. But then somehow, over the years, the chokehold had become an embrace. "What kind of minefield am I walking into here? Can you at least tell me that?"
As always, Natasha heard what he didn't ask her. "No. But I think you should let him fill you in on the rest himself. He is a historian, after all. Don't want to steal all of his thunder."
Steve laughed despite himself. "So you think I should do this?"
"I think it's been a long time since you've had a real adventure." Steve would have rolled his eyes at her mom-ing him if it wasn't, well, the truth.
Or: Steve receives a letter from Dr. J.B. Barnes, Brooklyn Historical Society. Except not quite that J.B. Barnes.