Short story-One chapter only
Kate and Yelena are a part of the Avengers.
Kate is hell-bent on her friendship with Yelena no matter what others think.
It's all totally platonic.
After the events of Hawkeye 1x06. The night before Yelena was standing in the middle of the ice rink, getting herself ready to finally get justice for her sister. The next day she was celebrating Christmas Day at Barton's house, watching how a little kid came running to them wearing her first vest.