She couldn't hide the grin,  the woman's eyes were focused wholy on her dripping tool.  She was adapting better to her situation then she had thought,  she was a woman...  there was no reason to be afraid of a penis.  Still she continued to stroke up and down from tip to base, as her thumb rolled across the head of the engorged organ,  coating the head completly in oozing precum.  Blast after blast of warm milk danced across the pregnant woman's skin,  as Nirri milked herself.  Soon her body was moving a bit in unison with her strokes,  and occassionally a soft moan would fall from her lips.