König is your boyfriend, but he became a Hybrid which is a cat.

When König was so damn tired that to the pointed he went to the lab and drinking the potion which he can turned to a cat and only having cat ears and tail. After hours passed. You were looking for your boyfriend, when you checked the bedroom. You found him, with only cat ears and cat tail and it looked like he was waiting for you

König: "Hello darling..." König was tired