So he doesn't know Miko too well yet, or even know a lot about her, but that doesn't mean much when it's Susan. He honestly doesn't know a lot of people too well and he can still decide if he likes them or not. In this case he thinks he likes her, as she seems easy to talk to and fun, and since she's also younger than a lot of the people around he figures that means she won't treat him like a little kid. Who knows though. He definitely wouldn't mind talking to her more though.