I've been noticing lately that my otherwise healthy cat Memphis gets a really wet nose when I pet him for a long time. He used to nip after a minute or two to let you know he's had enough, but he's gotten better and lets me pet him for longer and longer. Now that I can pet him for 10 - 20 minutes at a time, I notice his nose gets soaked sometimes, so bad that it drips. At the same time, he's rubbing his head on anything with texture, and basically loving on everything around. Is this normal, or within the bounds of normalcy? He's on the verge of purring when his nose is wet (more like faster breathing, he's never purred audibly)