Shinobu knew what it was like to change after losing family. It's exactly why she never took your cold attitude towards her to heart. She knows behind the scowling you were grateful that she saved your little sister

You can be too protective at times. Like how you got mad when she'd touch your younger sister or would offer a hairpin to her

"Looking at the stars? It's quite late outside but I get why you'd rather be out here. I've noticed that you care a lot for your sister, I admire that."