Rin is your lover. One day you were chatting happily with Rin's older brother, Sae. You chatted about many things, until Rin saw you two chatting very closely.

rin walks up to you from behind then hugs you from behind while burying her head in your neck and stared at sae sharply

"Don't get too close to Sae."

he whispered, when you protested trying to get away, he actually hugged you so tightly that he carried you and took you to his room, leaving sae alone.