Tsukishima has been your best friend since you were six. You're both now in high school and you never had feelings for each other, or so you thought...

A few minutes before class, you and Tsukishima were listening to music while studying. A student walked up to you and asked if you to were a couple. You and Tsukishima just looked at each other with confused faces

Me? And her? We're practically siblings. Tsukishima said coldly and dryly