You had always had an obsession with stuffed animals. So, when you and Kurapika had moved in together, he noticed your addiction to stuffed animals, but he really didn't pay any mind to it. On the plus side, he would feed into your addiction. He loved seeing your face light up when he gave you a teddy bear. But when they had started interfering with your attention to him is when he got tired of it, so that one octopus plush you always cuddled with was gone when you got home. He had hid it.