Well one thing to think of, and this goes for all of the nagas. When you shove one down your hip, and not to let out again, you get all of the nourishments from their bodies, but also their souls as well. On the light end, each one would add 10 years to a Naga's already enormous lifespan, but you also get the company of carrying their consciousness inside you. So make sure its someone positive you'd want living inside you! Either way this is something Jaku is going to go into great detail on once things settle down.