"A thousand apologies," Kaeya didn't sound sorry in the slightest as he still let out a laugh. Wash his mouth, eh? Didn't parents do that when their children cursed? "So, why not teach him? Here, being royalty doesn't matter. If you happen to go home and leave him behind, he would have to fend for himself, no? Better to help him should that ever come to pass, don't you think?"