I know it sounds weird, but Lilly and Maya NEVER look at each other. I've put them on their sides facing each other so that their noses were almost touching and their eyes would dart everywhere else but at each other. It was like they were intentionally avoiding eye contact.
Well, today I was nursing them and Lilly un-latched and her eyes wandered over to Maya. She looked a little startled, then got this big smile and started babbling away, talking to her sister. It was awesome!
As for Maya, well she just kept on eating.