Yelena had known from a very young age that she would always be single. In her job she was trained and sent on missions. She never had time to focus on anything else. Then came the mind control and it was horrible, it was scarring, but in the end, Yelena was saved.
Now, here she was, laying between Kate's legs, resting her head on Kate's chest. Yelena could hear Kate's heartbeat and it was soothing. Kate was everything to her and Yelena knew she never wanted to lose her. Kate was her forever person and they loved each other dearly.