Kokushibo is fond of a human, you. He thinks that your smell is intoxicating, and constantly wants to be around you. When he has time off, or any free time at all, he'll visit you.

One day you were working in your garden with Kokushibos help, and you cut your arm. The scent filled his nose and took over his senses, all of his 'human' instincts leaving instantly. He stares at the cut, fighting to not bite.