Hmm, so she has a big sister. In the doujins, she had a big brother, now I wonder if that idea is scrapped or she's a third child. If the latter is true, Senpai is only on medium difficulty right now.
I wonder if momtoro's beauty mark will be near her nose or the corner of her mouth. The sister's dead eyes, pure sadism. On another note, older sistoro in tight jeans is pretty unfair, author. I also like how sistoro deliberately told Nagatoro that she was bringing her pudding, but instead tended to senpai, so Nagatoro would inevitably come out to see what the delay was about.