Kieran rubbing his leg because, I dunno, it did something good.

Thinking about making Kieran's detached parts act sort of like a pet, hence why his tail is wagging. It's like they'd have a mind of their own (although Kieran can still feel them) but they're very obedient and respond to his thoughts. Its just that when left alone, they'll fidget and just kind of stand in place, awaiting orders.