That Ferris wheel scene was powerful. The combo of those three pages (29-31) works great to summarize Uda's complicated situation.
Also gotta give it to the author (again) that while still maintaining the policy of clear and honest communication between the characters, they managed to convey some level of drama. Well, sort of, Uda is keeping her feelings secret from "Riri". But that wouldn't really solve anything here and just make things even more complicated, so if anything that's preventing this whole thing to fall from the drama cliff completely. "Time and place for everything" and all that jazz.
For better or worse I don't think that'll turn bittersweet. Although I am curious about what will move this deadlock forward. Will Uda break under pressure? Will "Riri" realize something by herself? Or will our brave main heroines, refreshed after all the Christmas sex they had will decide to interfere? Or will we get a super surprise, and among all this sweetness our side dish will be a bittersweet one?