Classic 'build your friend up, your friend finds new friends and you feel lonely' story. I think Konatsu is afraid Honami is friend-cheating on her. She knows I guess that Honami will eventually leave for college. I guess Konatsu wants to tell her that she'll:
A. Miss her?
B. Wants to stay longterm friends with her?
Konatsu is being unreasonably awkward. Maybe she thinks she has nothing more to give now that Honami has more friend juice these days (strength to be social, positive and friendly; outgoing). Konatsu awkwardly believes she shouldn't dabble with Honami anymore, after all she has Kaede and stuff now.
Yet we see that Honami is already losing her grip a little and isn't totally confident.
Since yuri is so shameful, I guess it will be a friends confession after all. "I want to be friends with you!" "Oh God, seriously!"
They sure don't act like friends right now, who knew the road to friendship was so rocky? Or they're both awkward as hell.