There's a lot of perceived wisdom about keeping 2 (or more) cats that mine ignore - they have the choice of litter trays but only ever use one, and they prefer to eat from the same bowl at the same time even though there are 2 identical bowls of food.
I've mentioned in the past that Girlcat is clearly the boss over Boycat, but also seems quite protective of him, and today was the ultimate (IMO). Went in, put down the morning Dreamies and started to clean poo from the litter tray. Then I realised Girlcat hadn't eaten all the Dreamies - an unprecedented event; she had actually left them for Boycat despite being an absolute fiend for her treats! It wasn't that she didn't want any more, as I put a few more down after he had come to eat the ones she had left, & she went straight for them.