Mm, that's more than a success - Kate's plan succeeded and then she got a second, deeper kiss or of it, too.

And then she gets Yelena all tucked into her again, which simultaneously is so relaxing and also gives her goosebumps and makes her heart race. The idea that she's not the lucky one here is just absurd. "We don't need to think about that. Far as I'm concerned you can stay right there for like forever."