My 8 month old kitten drools when he purrs or gets excited. Sometimes he'll lay on my belly and when I get up there are tons of little waterdrop marks on my shirt.
Growing up I had a cat that sucked on people's ears like she was nursing. Purred the entire time which was pretty loud that close to your ear. My cat now sucks on blankets.
I have a few that do that too.. My male cat is 11 and is in his glory when he does it.. It's the ONLY time he'll purr.. and the baby that does it, she gets all into it and will fall asleep in her "sucking" position.. LOL