Birds fly over their heads trilling

A myriad of birds, singing high, flew over Macius and the naiads. As they disappeared under the many trees, Macius felt his now supernaturally keen senses focus on the girls. The smell of their hair. The color of their skin. The tiny droplets of water streaking down their legs. The swelling of their areoles, their pussies and their irises. His body responded automatically, his erection going from impressive to ****. The girls noticed and giggled, murmuring to each other words of praise his super-precise hearing could hear.

He smiled at them, and with this playful banter going on they soon reached a beautiful zone, similar to a clearing but covered in a roof of long branches and vines. The floor was a soft moss, warmed by rays of sunlight coming through the leaves. Warm water flowed into a thermal pool.

Macius knew, now, what his duty was. The naiads needed a new generation of babies, and he'd been lucky enough to be chosen to father the children of the mountain.