Yeah, T, they do play together! Actually, if Jethro thinks that Stella is not paying enough attention to him, he'll hop over and tap her to get her to play. It's so cute! He use to be an inside bunny (when weather is extreme we bring him in the house) and he and Stella would run from one end of the cage to the other and back (she outside, he in) -- forever!
She mostly just uses him as a treat dispenser, though