I cant say for sure but his name could be riku narsuki or the other way around. Idk much about how names work in japan so i really cant say for sure
Natsuki is Kurono's. Riku probably their nephew or others .
Chapter 30, riku is their nephew- the rabbit’s sister’s child
Riku is the nephew of bunny and wolf couple. He's mentioned in the start of the chapter because the first few panels are the mouse/lion couple dropping off the kids with the in-laws and bunny/wolf dropping off their baby with the sister and her family.
Both nukes are blushing because they are about to get some sexy adult time with their partners
What's the name of Kurono's kid? Is it Riku or Natsuki? Like...I noticed the 2 names kept switching around...