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Why not wrap a Lazy<T> and then lazy load the Lazy<T> in your Get

public class MyLazy {
    private object lazy;
    private object _Lock = new object();

    public T Get<T>(Func<T> factory) {
        if (lazy == null) {
            lock (_Lock) {
                if (lazy == null) {
                    lazy = new Lazy<T>(factory);
                }
            }
        }
        return ((Lazy<T>)lazy).Value;
    }
}

Taking advantage of existing features that have been tried and tested instead of trying to roll your own.