Given that the 3 pieces by this artist all have the tag "ショタ椛" (Shota momiji), I'm going to go ahead and say that this might not be futa.

Aya's mantra makes this pretty...not dark, but something. If she wakes up, Momiji will just rape her instead? Geez.

I see no downsides to Aya being raped by Momiji.