@Nnnieev Hello my beautiful reader!! Unfortunately, I can't answer the first question as it would be spoilers :(
As for the second question, they do love him. Lethally so, to the point to which anyone who sees it would think its a shallow infatuation, or, 'limerence'. But the truth is that they love him so much that it appears as if its a mere obssession, when in reality they just really, really love him to the point to which it can hurt, to the point to which they hurt him and can't see it through the haze of love. They're demons, and therefore their brains, unlike humans, can reach a point of love to the point to which its dangerous for the other person. (I don't know if I explained it well enough but if it still doesn't make sense be sure to let me know!!)