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