They're Satyr girls. Took nearly a decade after the game's announcement but we finally have Satyrs, everybody.
Edit to avoid doubleposting:
I love what they've done with the Satyrs so far, even if their sex scenes are limited. More helpful bimbos who are always down to fuck is really working overtime to make our Wayfort feel like a harem seeker's fantasy on steroids. And even better, another dickgirl who's happy to take it in the ass.
My main ask as a result of what we've seen so far, is for the devs to lean in - hard - to this wavelength of autonomous body parts and girls being taken apart for any future Atugia content. I don't generally have a fetish for this kind of body play, but if you're going to make her a girl with a detachable head, use it. That's been my central complaint about her all along, and I think it only requires a little imagination to make really kinky and weird-in-a-good-way use of the body magic little Piper displayed.