Whelp... the One-shot was kind of cute in a way... but the "expanded" story is... creepy... and not in a good way. "Tsundere" is one thing, but this is straight-up "yandere"... at best, and she's apparently surrounded by enablers (and not just a brother that actually seems to care about her and doesn't want to end up in a murder suicide by electric drill).
Mozuya-san (Mozuya-san Gyakujousuru) seems more relatable. So, won't keep reading this. For those that find some degree of enjoyment from it, I'm happy for you, though I suspect you could do better with other material. Just wanted to share my thoughts briefly.