It doesn't mean that he is with you when this happens; it's just more real because you are aware of it and you are using your conscious as well as your unconscious to form the imagery, which means you can make it seem very real and do things that you want to do - you can even try things that you wouldn't normally be able to do/get away with in waking life; though it doesn't mean that it will turn out the same in waking life as it did in your lucid dream, they're still dreams after all but you have more control over them and awareness while in them.