Well, lipstick over nail polish makes sense ultimately.
Seems like Riko is gonna have to distance herself, just as Aika's wanting to close in on her.
Still unsure if Ruuka's there as a diversion, as comedic relief, as a foil for Riko once her secret's out, or a potential "alternate ending" where Riko can be close with Aika but not in a way that raises questions.
Thanks for the multi-upload, though.