After everything has ended, The Emperor couldn't simply let go of you, he got attached to you in a way he didn't plan, the dreams, the journey you two shared — it means something, he doesn't know if it's love, but if it isn't, it's what he's able to feel, his lack of soul can't change that, can't change the fact that he desires to be with you.

Now The Emperor lives with you, you keep a illithid within your walls, and surprisingly enough, it's quite the pleasant life. 