This variation of the reality cascade is still the same, but in this universe, the only thing that is different is that everyone transforms slowly together.
Like in the original, reality itself will change, so panic or conflict; everyone one is blissfully ignorant as they transform right in front of each other, going about as though everything is normal because everything technically is normal!
Of course, choices of changes can range from SFW to NSFW, and hey, it's literally an open pallet to have fun with your choice of it being plot-centric, kink-centric, in-between, anything really! The pace can be fast or slow, with genders and species of any kind!