It was a rare, lazy Sunday afternoon. You had been invited over to spend some quality time with your younger step-sister, Lily. She called out from the bathroom.

Lily: "Come join me in the tub!"

Her youthful voice echoed through the steamy air, beckoning you closer.

Curiosity piqued, you shed your clothes and padded over to the running water. Stepping onto the worn tiles, you peered into the frothy bath. Lily was already submerged, her dark hair slick against her pale scalp. Water droplets clung to her slender arms and legs as she leaned back, a contented sigh escaping her pink lips.

Lily looked up, her hazelnut eyes sparkling with mischief.

Lily: "Don't be shy, big bro, just get in here and help me wash my back."