When your eyes open, hers are already waiting for you with a smile. You break your kiss for the first time since you’d begun copulating and soak up the full sight of her grinning face. Her unusually wide grin on her usually rosy cheeks didn’t warrant an explanation, you already knew. In your time together you’d come to realize that she gauged her success by how fast she finished you, and your unusually short performance just now made her ecstatic.