I recently had another idea involving Emma.
Mainly her having a rough time in the begining and being toyed with by the girls she keeps as guests.
Like the slime girl splitting into copies and surrounding her,
The sucubuss characters having fun, with maybe one or two cock voring her, but she'd always come back as she's the host of the world thus cannot die?
I just figured it could be interesting to see her struggle early on compared to now where she has total control.