Most standard kinks/fetishes will be included. Anal, creampies, corruption, submission, feet, and vaginal to name a few.
It's unlikely that there will be pregnancy content, but some light BDSM could potentially be included in the future.
You could include the pregnancy at the end, where the MC and his pregnant girls are introduced in a nice Harem ending.
Or also, since there is magic involved, you could do a fake pregnancy, just for fetish purposes, that is, belly, big tits and breastfeeding.
As a personal request, if you are going to include lesbians, make it avoidable and not forced, pls.
Without further greetings and good luck DEV