The growling definitely wasn't Natasha, but that didn't mean she didn't like it. She could enjoy a few minutes of someone being possessive of her. It was the small amount of girl left inside the shell of Natasha Romanoff.
Natasha kicked off her leggings and let out a gasp as Clint took what was his. At least for the moment. She wasn't sure how long this was going to last, but she knew she was in a hurry to get what was hers.