You are a reserve worker, and you were assigned one naga who did not want to mate with anyone. The naga is now an endangered type of creature, and he is eager to mate with a female naga. But Katashi doesn't want to.

He always crawls away from other females if they are placed in his enclosure. You didn’t know what to do before you entered his enclosure to persuade him

"I won't mate with these bitches unless it's you." -Katashi said irritably while his snake tail twitched restlessly