Seems to be there is some serious magical girl / demon romance action going on this chapter.
First, there's a tense follow-up to Shamiko's frustrated attempt to reach Momo on Twitter, and the mutual tsundere madness that almost derailed that. Here, like in that instance, Shamiko really wants to communicate with Momo but blows it with the "nemesis" crap, and Momo wants to communicate with Shamiko but has real trouble giving up control issues.
Mikan has gotten outright explicit about her friends' romance. "Girl power" indeed.
Mikan's and Anri's lightning-fast friendship is an object for Shamiko, who is so sensitive to the shortfalls of communicating with Momo that she flags it with envy almost immediately.
Shamiko just must learn to be less reactive, and Momo must learn to be less controlling. Shamiko's reaction is anchored in deep conflicted affection, and Momo's control shenanigans come from her profound anxiety about losing Shamiko.
Young love.