I also think like the first time MK makes like a monkey chirp noise, it's on accident, and both Macaque and Wukong are both like '!!! Baby!!'
Y E S
DAMN RIGHT THEY DID!!!
Mk just randomly chirped one day and the two of them practically broke thier necks/backs with how fast they whipped around (honestly wukong probably did but he just snapped it back bc haha 7 times immortal)
Mk's just like "???????????????????WHATTHEFUCKWASTHATWASTHATAWIERDHICCUPW HA AT??!?!?!?!!!!!!!!!"
meanwhile Macaque and wukong are just staring at him with stars in their eyes. Macaque ends up picking up mk like a baby monkey dragging him over where wukong is and they sit mk between the two of them and chatter like monkeys. Mk ...understands? somewhat what their saying. its slowly coming to him. but the moment Mk spoke his first chirp mac and swk were overwhelmed with parental monkey instincts thier not entirely aware of what their doing but its fine the grooming is nice and relaxing.
i like to think Mk can purposly AND insinctivly do a specific type of chirp that triggers the parental insints. and there are two types of this chirp
"i want attention"
"im in danger/scared/upset"
its almost impossible to ignore these and the moment it comes out of Mk's mouth their attention is yanked Mk's way and he's likely being picked up.
that or an angry monkey mom/dad is bursting through a hard surface to get to the baby of the group. (yes its mk of course hes the baby of the group thats why he gets all the dads hes the youngest--besides bai he-- and gets all the attention)