That’s a good thought! I never really considered that with Iruka, but I can definitely see it. After a long day, or week with noisy kids, the last thing he’ll want is more noise piercing into his head!
Also, I love punk Kakashi! I’m a little embarrassed of this now, since I’ve improved with my art, but I actually made a punk Kakashi in a Pokemon AU a while ago 
I think I’ve made him punk in a couple of other things, too, but I don’t really want to bring attention to them since they’re even older works 
Maybe that means it’s time to make another punk Kakashi