Nessa the Mermaid - 12 (Patreon)

Curious about the shadow that had fallen over her, Nessa slowly rose from the coral reef. She squinted slightly, gazing upward with a curious expression.

Curious about the shadow that had fallen over her, Nessa slowly rose from the coral reef.
Her boobs continued to shrink, gradually returning closer to their usual size. They were now around two meters in diameter.
Nessa raised one hand to shield her eyes from the bright sunlight, trying to get a better look at whatever was happening above her.
She squinted slightly, gazing upward with a curious expression.
What could possibly be casting that shadow?