The crown prince was tired and bored.
After he finished all his tasks today, he had nothing to do.
He would have gone to the king's room and stay with him because he missed his kisses and touches, but his majesty is not in the palace.
Four days ago, Amelia told the king how they needed to go back to Pheridor.
Augustine didn't want to leave because he hasn't received an answer from the crown prince.
His majesty needs to either get accepted or rejected by Claudius so that he can actually go back to Pheridor and carry on his duties as a king.
This is why Amelia got an idea, she asked if they can go to Pheridor for only a week then they can go back to Deprekia.
Augustine liked the idea but at the same didn't because he knows he will miss Claudius a lot and won't be able to think properly without his presence.
Nonetheless, Claudius had to convince him to go by hugging him tightly all night long.