The White Cat's Revenge as Plotted from the Dragon King's Lap Vol. 2 (manga)

While still transformed into a dainty white cat to avoid unwanted attention, Ruri introduces herself to Chelsie's son, Claus. Struck by the incredible power and unconventional (albeit adorable) form of this Beloved Child, Claus rushes off to notify the Dragon King of his unexpected feline houseguest. But they're about to find out that big trouble can come in small and fluffy packages--which will make it a lot harder for Ruri to explain that she's actually a human!