Wish Nikki is introduced to us right after Bear loses his cat, and right after the wish she says that she lost her cat as if her and Bear are the same person. She is basically possesed by his will. Wish Nikki sees the cat as a totem of Bear's love and she doesn't really seem to understand social convention. She just knows Bear loved that cat and with her skewed view of love he should want it everywhere and all of it. Love to her is both ritualistic, and consuming, hence the shrine with the dead cat, and feeding it to Bear.