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*Natasha shivered as she attempted to fall asleep. It was a frigid night and Bruce promised he wouldn't stay in the lab that late. Natasha always told herself that she was Russian and she didn't get cold, but now that she was lying there alone, she didn't know who she was kidding. It was freezing and she was alone. She heard the door creak.*
Bruce: Hey. Are you still awake?
Natasha: I couldn't sleep. The bed's too cold when you're not here
Bruce: I'm sorry.
Natasha: Don't apologize. You're here now.
*Bruce climbed into the bed and wrapped his arms around Natasha. She leaned against his chest.*
Natasha: There. That's better. Nice and warm.
*Bruce felt her breathing slow almost immediately. She was asleep within minutes. He planted one last kiss on top of her head and closed his eyes. It wasn't long before he was asleep as well.