Honestly, it's too bad that there isn't an official name for her. She's just known as Kotori's mom. She's had several DJ'ns made after her too. It's a shame, really, since she's a freaking good MILF.
Also, this Ryohka art is pretty fresh, as you said. Specially the bit about having an old dude doing the fucking. I guess that the male-lacking setting makes it easier to incorporate? I do hope, though, that she does release a sequel to this :p