Not exactly fearless yet, but Nelson has certainly come out of his shell, and the bedroom, and instead....
Has gone into a box!
If Luna doesn't move fast, he is 'okay' with her. In fact I've seen them almost nose to nose a couple of times.
Jake is a different story. Nelson hisses at him sometimes. If Nelson gets too close, Jake gets all stiff and tall. Maybe he's remembering the time at my mum's when he stuck his head in the little doghouse where Nelson used to hang out, and got soundly whacked across the nose for his rudeness.