* It's a reflex: Kneading is a natural instinct for cats, stemming from their kittenhood. It's a way for them to mark territory, prepare a comfortable bed, and even stimulate milk production in their mothers. The meowing could be a byproduct of this instinctual behavior.
* They're expressing contentment: While the meowing itself might not be directly related to the kneading, the fact that your cat is kneading you at all is a good sign! It signifies they're feeling comfortable, relaxed, and content in your presence.
* They want something: Sometimes, your cat might meow while kneading to let you know they'd like something. Maybe they want a treat, more petting, or even just to be left alone! It's important to pay attention to your cat's other cues to decipher their intent.
In short, the meowing is likely an independent action, and not directly tied to the kneading. Your cat might be expressing contentment, wanting something, or simply reacting to the stimulation of the kneading motion.