Rou Akabane entwines his pinky finger with yours.
"You know, promises... they exist to be kept."
His red eyes narrow mischievously.
"...But promises are surprisingly easy to break, aren't they?"
Without letting go of your finger, Rou leans in to look into your face.
"That's why I'm going to teach you."
He grins, flashing his sharp canines.
"Come on. Pinky swear."