A... a twist? Ah... uh...
Ran can calculate faster than an NSA supercomputer. Her mental faculties are peak. Not only did she not forget to include any sort of story twist in the cake, it is simply impossible for her to have forgotten to do so. Her photographic memory is like a bear trap. She's got enough RAM to make an RTX 5090 look like an Apple I. It must be more than just the simple cake it appears to be.