He's better off being a one-flat bunny than an outdoor-only bunny, by far. DO make an appointment with a good bunny-vet to get him neutered, that'll give poor Bonnie some peace! Until then, perhaps separating them would be best while you're not home.

A rabbit is a lot of responsiblity, perhaps the little girl can come visit your bunny, help clean the litterbox, etc., before she takes on the commitment of a bunny of her own!

As for games - each bunny tends to make up his or her own! Miss Hoppy (my avatar) plays with jingly balls, but only when we're not looking. But we play "toreador" every morning, I wave my bathrobe and she charges at it, grunting, spins around, a charges back through! Maybe he'll play that one? Until the *snip* his hormones are gonna be controlling much of his behavior, after it, as I said, he should give the poor kitty a rest!