I'm kind of expecting a scene where Sayaka is super determined to tell Touko her feelings. Goes looking for her and finds her ..during i dunno, a break maybe, in a quiet place like the cliche roof, where shes sobbing or something and muttering Yuu's name. Sayaka hearing that changes her mind and supports them or something. Well that is a cliche romance thinking but a theory nonetheless. And the ending will be the trip where theyre back together, or more specifically, officially together.