Ryan pulled up in front of Serena’s house, the headlights of his car illuminating the driveway.

It was late—later than he had planned—but Amy had been so full of energy after their day out that it had taken a while to finally get her to agree to head home.

Now, however, the little girl was barely keeping her eyes open.

She clutched her stuffed bunny tightly, resting her head against Ryan’s chest as he carried her toward the front door.

The moment Serena opened it, Amy perked up, her ...