Rylan didn't seem to mind. Not that I'm surprised though. She also didn't mind when he sat on her back and yelled "Yaw, giddy-up horsey" or when he used her as a step stool to get on the couch.
We're working on the whole "Brothers are supposed to protect their sisters" thing. Hopefully it will sink in before he does some serious damage. Until then... he can't be left alone with her!