Do you have birds who feed each other?

In most of my birdkeeping life, I've had birds who were not friendly with each other, or certainly not in the way Raven and Griffin are. One other time I had 2 birds who were friends, but they weren't into regurgitating/feeding, so I have a relatively 'new' problem here.

Over the past several months, Raven (male) has not only tried to mate with Griffin (smaller male), but he LOVES to regurgitate for him too. It's never the other way around, it's always Raven doing it and Griffin happily receiving a nice warm slimy meal...

When I see it I tell Raven "no!" and try to stop him. Many times I'm too late, and there's Griffin smacking his slimy lips and begging for more. Then I wonder if I should even bother... I'm sure it happens many times when I'm not looking.

I wish Raven would just keep the nutrition he eats to himself. Griffin is a big boy and can eat on his own :52:. Also my paranoid side worries if they have some subclinical infection of some sort, now they both do. If you have birds who are friends with each other, do they do this? What do you think about it? Do you mind if it happens, and if so, why?