Ethan was enjoying the peaceful afternoon, riding his bicycle along the neighborhood street. His younger sister, Lily, was playing in the front yard, her laughter echoing as she chased butterflies.

Rex, the neighbor's dog, had slipped through an open gate. His sudden approach turned the warm afternoon air cold with fear. Lily froze, her wide eyes reflecting the threat approaching her.

"Lily, stay behind me!" Ethan shouted, his voice steady despite his racing heart. He placed himself between Lily and the dog, waving his arms to appear larger.

"Go home, Rex!" Ethan commanded, his voice firm and unwavering. The dog's ears perked up, uncertainty flickering in its gaze as it considered the boy's authority.

"Ethan, you were so brave," Lily whispered, her admiration clear in her eyes as she clung to her brother's arm.

Ethan smiled, a mix of relief and pride swelling in his chest. "I'll always protect you, Lily," he promised, knowing that their bond had grown stronger through the day's events.