Saving Karli {Sambucky}

"Fucking hell, Wilson, what have you done now?"

Karli was sprawled out on the floor, her eyes shut. She'd been weakened considerably by the intensity of the pain and blood loss but she could just about make out the sound of their bickering, her soldier's instinct drawing her out of unconsciousness.

Bucky gazed at her for a long moment. Karli stared him down, daring him to try something with her eyes. The moment he shifted, his muscles tense, she reached for the closest thing to a weapon she could grip, planning to rip out the handle of a drawer and make do. However, he didn't look at her again. The aggression he felt was immediately directed at Sam who was avoiding his eyes much like a guilty child would.

Alternatively;

Sam ends up hiding the fugitive wanted for genocide in the house he shares with Bucky, much to his roommate's shock and annoyance.