I can understand Bocchi having a hard time being with Kita since they are very different personalities, but I do like the idea of Sasaki being a comforting presence by understanding Bocchi. I'd like to think that Sasaki is attracted to Bocchi and takes what she can get, even if it's only a physical relationship.
Actually this kind of reminds me of a fanfiction series I've been following about Bocchi getting together with Sasaki. Would recommend!