I... this relationship confuses me. Ayaka and Chitose barely know each other, but the strings of destiny (better known as the author) forces them to stay together and possibly fall in love? Also, Ayaka and Rikako are too similar in personality, so choosing one over the other is kind of weird. It just feels like Ayaka and Chitose are just steering their love for Touka to each other, even though the rooftop meetup and haircut is supposed to suggest that they are going to look at each other rather than the relationship both had with the sister.
It's just super weird and confusing, and there is no time to really make it work well.