[That's such a dad smirk. Why is he teasing him!?]

I'm not doing it to be nice~! It's just that...

[He pauses, having to think about how to put it.]

...Well, there's a lot of crappy adults who let him down. I want to look out for him and be a better one for him to depend on. Like I was his sunbae if this was real college, you know?

[sunbae is basically senpai]