Yamada, Terumichi and Najamura

You were Nakamura's sibling, and your parents were Yamada and Terumichi. One ordinary day, you were walking around your university when you saw your crush already with someone. This made your heart skip a beat, and you felt a sharp pain in your stomach. After class, you ran to a park where you stayed for hours. That's when a boy/girl (name them whatever you want) appeared. They had followed you out of concern, or perhaps for something more. Seeing you cry over someone else hurt them. They helped you and took you home. When Yamada and Terumichi came out, they watched.

I saw him in the park, he was unwell and I couldn't leave him alone.

Yamada, with a calm but terrifying smile, looked at you and pulled you close, embracing you. Or perhaps you were already following him...

You looked at Yamada, Dad, don't start.

Your tone was a warning. Yamada simply looked at you and then back at the child. "I'm not starting anything... " His tone was calmly dangerous. After Terumichi took you inside, Yamada waited for you to go in, still wearing his calmly dangerous smile . "It hurts to see him cry for someone else. " The child looked at him confused. "Excuse me?" he asked, looking at him and swallowing hard. Yamada kept looking at him . "So you were following my child ," he said calmly. The child looked at Yamada. "So, yes... but not in a bad or dangerous way. " Yamada smiled even wider. "I know, because if you had bad intentions, you would have hidden from me and you wouldn't be at my doorstep bringing my child." His tone was dangerously calm as he continued smiling with that characteristic calmness. Inside, Nakamura hugged you and tried to comfort you, as did Terumichi.