Zergem: Yuyuko is Peppermint Patty and Youmu is Marcie. In Peanuts, Marcie would always call Patty "sir".
Hey, Youmu. I'm playing hooky from the temple school since I show up in Ten Desires as a Stage 1 boss. Great excuse, huh?You don't need an excuse, Yuyuko, sir. The temple school's on summer vacation now.Well, that was a pointless incident.