About yuki finding someone she love to keep her warm, it's kinda hard knowing she's so sensitive and her 'sister' possibly interferring with her relationship. her sister could be a yokai, but not a yuki onna, maybe a jorogumo, which is a shape shifting demon. The hints are in second story, when the second guy comented on her body heat and the fourth story when the stalker guy comented that she's not that 'cold'.
I'm hoping a continuation, but if it's end like that, it's okay too. Yuki could reject him off screen or they could end up together again, he could move with her from place to places while writing, like his dream.