Boy, the VN tag is certainly warranted for this project, the amount of text in just the 0.4 version of this game is enough to fill an encyclopedia.
Anyway,
mother getting gangbanged by zombies was very, very hot. Hoping for a lot more of that with both her and the sister, watching them become depraved would be quite fun.
As some others have noted, the sister's presence in the game is... weird. Overall I like her role as the annoying brat, but sometimes she's almost
too annoying and not an enjoyable part of the story. Also,
something is wrong with her face - not sure what, maybe something to do with her nose? Either way, the mom's body being more desirable is understandable, but the mother's face is also far prettier than the sister's for whatever reason. Even if I liked the sister more than the mom - which I don't - the attractiveness of the models definitely makes me far more hyped for scenes with the mom.
Is it wrong if I hope that eventually I can just romance the mom and throw the sister to the zombies?