Nothing in Bealia or the neighboring countries was a match for the four kryptonian dragons. Not only did they decimate the city of Bealia and its country, they also cut a wide swath of destruction throughout China, Japan and South Korea for hours; until the sun began to set and the beasts instinctively retreated for a place to spend the night.
Nothing at all remained of Superman, Power Girl, Supergirl or Faora. Their brains were in fact, very simple. Similar to those of earth-based dinosaurs and reptiles, the krypto-dragons behaved out of raw instinct, guided by only the most basic needs: surviving, feeding and... mating. As the mighty black dragon Superman had become used its massive claws and raw strength to dig a path through a mountain in the Himalayas, its female kin began seeing him under a different light...
Two-hundred feet, five hundred, a mile... the Monster of Steel kept tunneling under the mountain, clawing and pulverizing solid rock and metal ores as if they were simple mud; following his instincts. He needed a cave for his kin, a well secluded place to have his mates and future descendants safe while he was out, hunting for food.
And he found his refuge six miles underground, where the layers of rock gave way to a cave flooded by rivers of lava. A place so hot that not even the hardiest man-made machines would be able reach in a million years. A safe place.
With a thunderous roar, the krypto-dragon pounded on his chest to signal the three females they had finally found a shelter. The three female krypto-dragons roared back and crawled down to a large island in the middle of the rivers of lava. There, the female black krypto-dragon, Faora, began circling the transformed Superman and presenting herself, ready to mate.
The other two, the golden-furred beasts Supergirl and Power Girl had become; waited expectantly as Superman began mounting Faora. The cave quaked as the two beasts rutted out of control, pounding each other at full strength and causing shockwaves that made a good chunk of continental Asia tremble like jelly.
Superman's long, powerful penis erupted inside Faora's womb, filling it with his seed. The black she-dragon let out a booming howl as it collapsed in exhaustion under her mate. He, in turn, snorted loudly and reached for the large blonde that had been Power Girl.
He no longer recognized her as his cousin. In his diminished mind, the blonde beast was only a potential mate. One he would claim. Roaring, he mounted Power Girl and filled her, too. After that, he repeated the same process with Supergirl, ignoring how small she was in comparison to Faora or Power Girl. She'll eventually grow as big as them, as he could smell she wasn't fully developed. It didn't matter. She had a fertile aroma. She would be his.
After finishing, Superman finally decided to take a break. Folding his wings, the Monster of Steel laid down and curled into a ball, not unlike a cat. His mates did the same, too, cuddling up with him and eventually falling asleep.