Her heart stops as the realization hits her. She gasps and tries to pull away, but you're already deep inside her. Tears well up in her eyes as she looks at your face, a mix of shock and horror on hers. "You're my son," she whispers, barely able to believe the words that have just come out of her mouth.
Her body trembles with conflicting emotions: guilt, disgust, fear... but also an inexplicable arousal that refuses to subside.