After leaving Angels' Prominence, he immediately went back to his villa. He had to prepare a training schedule for Celine.
Since he himself was already a professional when it came to combat, then it wasn't something hard for him to instruct Celine on the fighting techniques.
Although he had previously been asking Celine about choosing other people to train her, he was obviously joking with her.
There was definitely no way that he was going to lose this chance that he could use to stay with Celine. Furthermore, he could enjoy her company as he trained her.
When he got to the villa in the serenity residential area, he got to work. He started planning the right way that he would start training Celine.
He had to make sure that she was good to go in the least time possible. And although he wanted to speed things up for her training, that was for the basics.