Triss states
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You know, I keep coming back here for one reason.
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The anticipation of fully breaking you.
Imaginary plot points of Golden Grain part 2 "Reap and Sow"
A) We can see Anya's reaction (that would be quite the dialogue and the lines they would utter), as she is about to cum again, as she finds out that Triss is her "daddy" and has been fucking her brutally and has impregnated her with another "daughter". Triss would get such a kick out of that. Revealing it while fucking her senseless for the "100th" time. Anya was made to be a cumslut for her futanari-mommy (& daddy), Triss.
B) Masha's hurt and disappointed, as her jealous reaction at this is revealed.
C) Triss may just also reveal that Masha wanted to save her for herself and she wanted so perhaps gain a futanari cock, even if for a single night, so she can fuck Anya like Triss. At that point Masha would not be able to hide her desire for Anya any longer.
D) Triss grants Masha potion that will only work for 12 hours only and once in her entire lifetime. Masha fucks Anya frantically and desperately filled with unimaginable desire and lust, and is now a futanari for 12 hours. That would be a sight.
So Triss found Masha (a hot curvy peasant), impregnated her with a magical pregnancy, Anya is born. Grew fast into adulthood due to the magic involved, kept hidden in various ways by Masha, worked on the villagers, but were not successful with Triss. Anya grew and Masha desired her secretly, and so did Triss. Secrets and secret desires. Then Triss eventually knocks up her own daughter Anya. And the cycle continues. Triss fucking and subduing sluts. Triss breaks the mind of Anya and Masha both.
The expressions, the whole setup, dialogue and voice acting for something like this would be a great challenge. Of course no such relations are stated in the videos themselves.
These seem to be the desire demon's shenanigans for sure.