Knowing this series, they'll hit heads just before anything happens.
Nah, the real goal of the body swap is clearly getting them to wash each other while still having the excuse that they're only washing their own bodies. :D
Although hitting heads right as they're about to do so and finding themselves face to face with the naked other would be fun as well.
They're totally gonna slip in the bath after they're done washing their respective bodies, land atop of one another, hit their heads and lay there in their birthday suits. Hino's gonna land on the bottom and Koguma on top. Having switched back, Hino will naturally wake up first and decide "this isn't too bad, no reason to wake her up" (while also internally steaming, cf. my profile pic) and just lay there, with maximum body contact, until Koguma wakes up and will be slightly flustered by the situation.
(Mind you I have not read ahead, this is pure speculation based on what happened up to chapter 102 :D )
Perfect.
I'm either right and nothing happens, or the scene actually plays out. I win either way. Although now that I think about it, this manga can do some weird hidden option (C).
We certainly won't be getting all of Zormau's plan, that much is sure, unless we're nearing a sudden end. This series has been very good at keeping the progress slow, just one step at a time. And, of course, at subverting expectations whenever possible.
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