Is it a male female pair? If it is you'll have babies in no time. My rats would never bite me, I keep them in glass aquariums and they watch me working in the snake room / rodent room every day. I imagine if I kept them in tubs where they couldn't see me they would be totally different animals and probably be really scared of me.

I know now a lot of snake people that have pet rats and sell the babies and use a few for their own snakes. Although now you may have to always buy frozen thawed because of your family bonding with the snake food LOL.