Java reflection: access private method inside inner class

I'm having issues using a private method inside a private class inside a public class using the reflections api. Here's a simplified code example:

package OuterInnerMethod;
public class Outer {
    private class Inner {

        private Integer value;

            private Inner()
            {
                this(0);
            } // end default constructor

            private Inner(Integer y)
            {
                this(y);
            } // end constructor
        private Integer SomeMethod(Integer x) {
            return x * x;
        }
    }
}

Again, I want to be able to instantiate an Outer class object then call SomeMethod from the private Inner class. I've been trying to do this with reflections, but I can't seem to get past 1 level in. Also, the inner class may or may not have a constructor which most code seems to use. The above code is just the framework.

My current code:

Outer OuterObject = new Outer();
Constructor<?> constructor = innerNodeClass.getDeclaredConstructor(Outer.class);
constructor.setAccessible(true);
Object InnerObject = constructor.newInstance(OuterObject);
InnerObject.SomeMethod(5)

I looked up various ways to get to an inner class or private method, but can't find a way to get an outer object to an inner object without using the constructor. I'm only interested in using the private method in the inner class on an element in the outer object.