How to use System.Lazy with Setter to Lazy Initialization of List in POCO Entities?

I want to use System.Lazy to Lazy Initialization of my List in my Entites:

public class Questionary
{
    private Lazy<List<Question>> _questions = new Lazy<List<Question>>(() => new List<Question>());

    public IList<Question> Questions { get { return _questions.Value; } set { _questions.Value = value; } }
}

The problem is on my SETTER, get this error: The property 'System.Lazy<T>.Value' has no setter

If i want to do MyInstance.Questions = new List<Question> { ... } ?

How do I proceed?

Update:

I'm trying to avoid that:

private IList<Question> _questions;

//Trying to avoid that ugly if in my getter:
public IList<Question> Questions { get { return _questions == null ? new List<Question>() : _questions; } set { _questions = value } }

I'm doing something wrong?