Stay with me with this idea,
human come from monkeys, most Galra? Felines
So young kits purr when they are the most comfortable and hissed when uncomfortable. The hissing is a life long trait but the purring? about 40% losses the ability due to puberty, some lose it to repressing the urge for years.
Kits have the soft scuff spot on the back of the neck, just about were the nape is. If you pinch it they freeze and occasionally get low to the floor. As they get older the part strength to normal muscle both from growing and having it pinched when young.
So Keith? he still purrs, it happens when he’s in a deep sleep. He has 0 clue. And his neck, pinch it and he will freeze and get lower to the ground. It takes dumb long for this to be figured out about him.
-🌙🍃
I feel like Lance is the first to notice the neck thing, noticing it because it's so easy to yank Keith back once the collar of his uniform or clothes is pulled. Unlike Pidge who would probably still go at them when grabbed as if she were a dog ready to fight. Keith? He reacts even with clothes. And Lance would probably accidentally find out about the nape of the neck thing by accident. Or by seeing Kolivan or Antok grab him and Keith just reacts.
The fact that Keith doesn't notice it right away, it probably takes a few months after Lance notices.
Keith: And they just grab my neck. And I can't help it! It's like I can't fight! I just... go flat! Lance: You just noticed? Keith: What? Lance: Yeah, seems to happen a bit with your clothes, too. Less freezing up, but it's easy to pull you back, like some weird cat reaction. Keith: ..... Keith: IT'S BEEN A THING THIS ENTIRE TIME!?!?!?!?! I THOUGHT PIDGE WAS JUDGE FREAKISHLY STRONG PULLING ME ALONG BUT SHE'S BEEN TAKING ADVANTAGE OF THIS REACTION BY GRABBING THE NECK OF MY JACKET!?!?!? Lance: No, no, she is freakishly strong. She can hold up Hunk, remember? Keith: Oh yeah. But still. This is a thing?!
Poor Keith. I feel like a lot of the senior Blades do this a lot if Keith gets hot headed. Bonus: they try this on Pidge because she can be chaotic and dangerous, but it has no effect. Any other Earthling reacts by freezing up, which differs from how Keith reacts, but Pidge does not and she twists on them and finds a way to get loose. Keith finds this absolutely hilarious.
I feel like being half-Galra and more reptilian looking, Regris might not purr (or as loudly?). And with the idea that he's about Keith's age (not much older), he might also have the "go flat" reaction. The difference is that his tail either lashes around in reaction or wraps around his ankles.













