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Natasha really just meant to visit her sister. She hadn't been expecting this. She had to admit, though, Kate and Yelena were a cute couple. Yelena seemed soft for Kate. It was adorable.
She decided that she would come back tomorrow and that she would text first the next time. She just witnessed something private, something Yelena hadn't been ready to share yet.
No matter how cute Natasha thought the girls were, she wasn't going to say anything. Yelena would share things at her own pace.
She had chosen well, though. Kate looked at Yelena like she hung the moon.