My fave trope is that they supposed to hatefuck but one of them catches feelings. Luci wanting to make Adam submit to him out of payback but seeing how in such a pitiful and battered state Adam is he decides to change up his way of breaking Adam. Like spoiling him and treating him so soft despite Adam's chagrin. And also making sure he gives Adam enough comfortable breathing room like he still has a say,boundaries to give illusion hes not on a tight leash.
He wants to break Adam with kindness, so that Adam's guilt acts up, pride cracked and make him submit completely to Lucifer.
But at the same time Lucifer fighting his guilt, feelings and attraction for the angel while he does this to keep up appearances that hes in charge.