So the only thing new added to Darkthorn keep past is some lore. You go to the west wing after lying about Lynevere sending you there. You then see three women in the padded cells, two of which are getting railed by magihounds and one with green hair and big tits just watching and waiting because it'll be her turn eventually. That's it, that's literally it, just some pixel sex and maybe some foreshadowing. I actually went and redid the game to see if there would be anything new when you came to darkthorn keep again. Lo and behold I found the green haired busy girl in a cell with two other girls with no magihounds this time. Could she possibly be a side-quest character?