A knock sounded softly on the door. She looked up from her perch on the windowsill. The lights of the city down below had been holding her attention for some time now. Assuming that it was Clint, she got up to unlock the door. Nobody else but him would be there, especially at this hour. She unlocked the door with a loud click to let him know he was welcome, and then went right back to her seat at the window. There were no formalities between her and Barton, only familiarity. However, the door didn't open immediately. Clint's I-don't-give-a-shit face didn't appear from around the door. Instead, there was a long hesitation before the handle turned. There was no confident entry. The perpetually-out-of-place face of Dr. Banner sheepishly peeked in.
She sat straighter.
"Doctor."
"Hi." he said awkwardly. "Can I, uh, come in?"
Surprised, she paused.
"Yeah. Of course."
He stepped in quietly and closed the door behind him.
He could already see it on her face. Her fear of the Other Guy.
"What can I do for you, Doctor?" She asked.
He fidgeted with his hands and stepped forward.
"I came to apologize."
"What for?"
"For trying to kill you."
"That wasn't you."
Bruce looked down.
"Yeah, well, I'm still sorry."
The corner of her mouth turned upwards.
"All's forgiven." she said indifferently.
He looked back at her. "But is all well?"
"What do you mean?"
"I mean..." Bruce took a few more steps toward Natasha. "Regardless of my responsibility, the Other Guy still attacked you. ...Are you ok?"
She was taken aback. She didn't know why.
"Yeah." she said quickly.
"But you're eyes still follow me around." He said.
All at once she wasn't the secret she thought she had been. Suddenly out in the open, she reacted accordingly; fast and fiercely.
"Because you turn into a monster! What do you want from me, Bruce?"
He bit his lip.
"And I'm sorry for that."
Natasha was silent.
They both knew he couldn't help that, but what could she say.
He stood awkwardly for a moment.
"Well," he said "goodnight then." And he turned to leave.
"Goodnight." was all she said as she watched him go.
Bruce opened the door and slipped out into the hall.