I never see any games do MomXDaughter thats not in a threesome, off the top of my head I can name two: This game and A Town Uncovered. I'd like to imagine that some point in the future he will add more to it and expand upon it, the taboo aspect is amazing, could add scenes of callum watching them from a doorcrack, or them doing it in front of him in a non-visible way, like in A Town Uncovered where the sister is sucking the Moms breast but the MC doesn't notice. (but I guess ppl will bitch about it being sort of NTR)