Lucas' POV
It was getting late and William still wasn't back yet. Daylight was soon turning nightfall and Lucas' had 'worried' his brother went wondering to Princess castle probably doing things he shouldn't. No one in the castle knew where William but they hoped he come soon - dinner was soon to be served; though, Lucas himself knew he wasn't coming back anytime soon nor for dinner. Instead, something deep inside Lucas told him Will was at the Princess palace and telling him to check there. And without hesitating, that was Lucas did. He changed himself into his golden Armor suit and wasted no time to go his horse and be off. The trip to palace wasn't far away unless you had slow horse, but since Lucas had a fast stallion it probably take a hour or so.
(at this moment, do you want to claim William and Celestia are doing it right now or no? If not, I can continued with her POV)