Quite nice. Zombie apocalypse is one of my favourite genres and I liked setting here quite much. I loved how scenes with sis and mom grew more lewd and some of them were quite fap worthy.
I had couple wishes with the story that haven't, at least yet, been realized.
I wish MC could find the girl he saved from zombies, but who ran to other direction after the save. There's room for more in the harem. But I expected that happen only after MC had bedded his sis and mom first, before adding more girls.
Seeing that there's horny zombies, how about horny zombie girls, perhaps some of those specials, half-human/half-zombie who has retained some of her humanity.
Cliffhanger in the end.
MC getting bit was kinda surprise.
Perhaps those newcomers have some medicine that prevents infection.
Or MC turns out to be some experiment of his father's and to be immune to the disease. At least I got the impression that his father might have something to do with the research that went awry and started zombie epidemic.
Or they could just cut out the infected part of the shoulder fast.
The appearance of other group certainly increases opportunities for storytelling. Especially when there's so hot girl among them.
I've always wondered why it's so rare to see any of the people in zombie stories putting some armour on. That's what I would do. No need to go with the full medieval armour style. Just something to protect neck, shoulders and arms would go far to protect people from getting infected. Even tin cans would provide easy to find material for such protection. Not visually very pleasing though.
Anyway, I'll be following this one, and waiting next update eagerly.