Mine play fight for most of the day too. My girl comes back for more all the time but I do have to stop them when I hear them getting nasty with eachother. I sit them on my lap and make them give eachother kisses
and tell them NO, not nice. 15 mins later they are back at it again but I do know they love eachother and cannot live without eachother...guess they get on eachothers nerves every once in a while and plus Mimi has a hard time sharing.