Rikka x Yuuta is officially already set
I don't know how Isshiki and Cumin gonna played out, but i think they will stop at teasing (with Cumin is totally airhead that is). And i thought Cumin x pillow was the OTP...
There is still Shinka x Dekomori through. With the fake Summer Mori still a thorn on Shinka. Hopefully during their cultural festival performances, Shinka would have to return to her Summer Mori mode at one point to help out Rikka's confession (she is the Love
Cupid Fairy afterall), and impress Dekomori greatly. Then they can return to their rival mode but with Dekomori now start to half-believe on Shinka's claim