multiple bugs showing up. in one instance not all the woman advanced through the wood to the ritual location. another time when prompt to cavort with the women i couldn’t interact with anyone at all. couldn’t find anything to advance the quest. another time i interacted with one of the woman while they were on their way to the site. she told me i could watch if i was a good boy. she just stood their afterwards and the quest wouldn’t advance no matter what i did.
Edit: Seems lockpicking the horse’s arse progressed the quest. no, i’m not joking.