I had several sketches to that effect but as I wrote the full story, a more gradual psychological conversion emerged. At this point I don't think Alison would need any magical or physical convincing to end up on her knees.
>what's the light level on the bands indicate?
As established in the full Dark Altar comic https://satinminions.com/img/Dark-Altar-00.html the enchantment on the bands makes her submissive/lustful for her assigned demon partner. It may also have something to do with summoning him.