I found a picture on Pinterest, where Nat and Steve stand under his shield while rains - I found it so cute, I had to write it :)
You Can Stand Under My Umbrella
"He seemed pretty intimidated when you threatened him," Natasha winked at Steve as they casually walked through the lobby of the hotel they'd just fulfilled a mission in, drawing a lot of attention on themselves thanks to Steve's uniform.
"Well, I actually think it was you he was afraid of," Steve grinned back at her as he held the doors open to her. Side by side, they stepped onto the street, though stopping under the awning over the pavement as they saw that it was raining heavily.
Natasha frowned and briefly glanced at her watch, mumbling:"Dammit. I am going to miss Criminal Minds if it doesn't stop raining soon."
"Oh, we can't have that," Steve exclaimed after a short moment of silence and offered her his hand. Natasha threw him a questioning glance.
"What do you want to do about it?"
"Do you trust me, Romanoff?"
"I feel like I shouldn't. But that never kept me from doing anything," Natasha sighed and took his hand. Steve smiled softly before pulling her closely to his side and raising his vibranium shield over their heads like an umbrella.
"I would be a bad gentleman if I allowed a lady to miss her favourite show," he explained as he led her onto the pavement, and Natasha laughed lightly, slinging one arm around him as they walked through the puddles that started to form, pressed closely together.