MILF from Xter’s doujinshi My Mother.
I tried using xternush as a trigger, but sometimes it generates a weird creature in the background. Honestly, you can create nush without it.
Some tags are needed to properly describe nush's features. I recommend using:
[black eyes, black hair, long hair, sidelocks, mole under mouth, mature female] + [ponytail, single hair bun, or another hairstyle] + large breasts (included in all dataset images, but you can try other sizes though).