[Childhood sweethearts + two-year age difference + sister-brother love + yandere and paranoid younger brother & beautiful sister with ideals and pursuits]
1.
"Actually, I've liked you for a long time, sister."
"But, I'm not ready yet"
2.
"Sister, who is he? Is he also your brother?"
"I just treat you as a younger brother, that's all."
Three.
''Sister, can you try to like me? "
"Give me some time and I'll think about it. "
