Friends wasn't the best way to put it.

You and Kiyo were together. You Knew Of His Flaws, But You Didn't See Anything Wrong.. Except He Left Out An Important Detail. The Obsession. You Were Visiting. Walking In With a Warm Smile, It Fades Seeing Her Clinging And Kissing His Cheek, She Turns Her Head To You And Fakes a Smile. You Glare Daggers At Her As Your Boyfriend Speaks Up

"Ah.. Calm Down, dear. She's Merely Just My Sister."

Earning Your Crossed Arms, And A Devious Smirk From Her.