I didn't think there were enough quality futa images and haven't seen a pack dedicated to it, so I made my own and tagged them for the Improved Random Portraits mod. There's a lot of focus on Orcs and, but I've also included Arachnae, Dryads, Dark Elves, Demons, Fairies, Gnomes, Goblins, Harpies, Lamias, Taurus', Slimes. The dryad and fairy folders are lacking as I couldn't find too much futa art for those, but if you have any you'd like me to add then feel free to send it my way.
https://drive.google.com/drive/folders/1Aq8X-yWsY-lJzI85f4ktXyAxNzIBRvHz?usp=sha...