Killcode trying to play off Bloodmoon’s disappearance as unimportant, and trying to act like canon, but he’s actually hiding that he’s very distressed about his favorite sons being missing, and it’s making him regress?
KC regresses almost instantly after the news. He tries to appear uncaring, he really does, but Eclipse realizes he's small and tries to contain him in the lab but is unsuccessful.
KC ends up going back to the daycare regressed because he and Moon have a deal with their body and he can't just let Moon come back out in the lair.
Eclipse furiously makes a body as quickly as he can and follows him because he won't let him leave alone, he's a baby! He can't let KC leave alone when he's so clearly distressed.
Moon can clearly sense his distress, though he doesn't know why, so he lets KC keep the body a little longer than normal, which leads to even more panic in tiny KC on top of the grief and panic over his youngest sons' disappearance.
Now that KC is panicking, Moon can't just force control, that'll scare KC even more, so Moon has to ping Sun and Lunar from inside his head that KC is panicking and regressing and they need help.
Lunar comes souped up with pacis and stuffies and a big blanket to wrap KC in while Sun is struggling with what exactly to do (brand new caregiver panic).
Sun gets shoved off by Lunar to go get KC snacks and make a sippie with juice. Lunar shushes and calms down KC enough he can sniffle out 'my sons are gone'.
Moon immediately pings Monty and sends him and Eclipse out to look for the twins, who they find giggling and hiding in an alley killing rats to pass time.
The twins get a thorough reaming by Monty and Eclipse about 'it doesn't matter if you're seeing if your father cares about you or not! he's a literal baby right now he's so worried!'
Monty and Eclipse haul their asses to the daycare and drops them off to the balcony room where they've had KC finally calming down and fixated on Brave for the last hour while Lunar, Moon, and Sun are taking care of him.
KC bursts right into tears again seeing them and the twins just panic like 'oh shit, he's small'. They've never seen their father cry before and over them? It's almost unbelievable if they weren't watching it happen.
The twins cry and apologize and cuddle him and apologize some more until it ends with a cuddle pile in the balcony room.