After discussing things with her eldest sister and brother Allen, they ended the call. Shaarya returned to patching up Kazuya's wound. Moments before, when she heard those words, she felt that her whole world had fallen apart. She even looked at Kazuya like he was the enemy.
But, now, Shaarya was calm. It's not this man's fault that her sister likes him. Though she only heard a brief interaction between the two. Shaarya could tell that he obviously cared a lot about her sister. Her sister seemed different too.
Since the call ended, the man named Kazuya was awfully quiet. Shaarya herself wasn't a talkative person, so she usually would not mind the silence too much. But, right now, she had a lot of things she wanted to discuss. According to her second brother's letters, this person has been spending the most time with her sister the last two months.
The song is "Dearest layla" by Eric Clapton