Is there such thing as "NCO Business?"

Despite how many times West Point told me that there was no such thing as NCO business and I shouldn't accept that as an answer, I know better.  But before you should go and always accept that as an answer you have to make sure that your unit (you're a 2LT so I'm assuming you have a platoon) has the right climate.  Respect and privacy is earned.  As long as you know 100% without a doubt that "NCO business" doesn't mean "wall-to-wall counseling" then I think you're ok and you should be.  I've always been lucky enough to have outstanding NCOs who took care of the day-to-day, were proactive and I never had to tell anyone to do something more than once.  However, as a Tank PL, I had them try telling me that when we were doing maintenance.  "Sir, you do what you've got to do, we'll take care of the vics" kind of thing.  I could have accepted that but it's just not in me.  A)  I don't shy away from manual labor - comes from being raised on a farm.  B)  It provided me an opportunity to learn more of the technical aspects of the vehicle I was in command of.  C)  Getting down and turning wrenches with the guys is where/when I learned more about their personal lives than anywhere else.  So basically, you need to find your own balance based on your personality, strengths, and weaknesses.  Other than that, trust your NCOs to do the right thing and to inform you when something escalates to a level that needs your attention or at the very least that you need to know about.

Im an NCO and I own 2 businesses.

Of course there is. Just like there is Officer Business. There are things that should be kept "in-house" and handled at the lowest level possible.