While she kissed Eileen hazily, Ty's mind gave her a vision of the result of Eileen's thick semen flooding her womb. She saw how deep inside her were masses and masses of sperm, which swam tirelessly through her passages hunting down an instinctual target. It felt so weird to her to realize that until a few minutes ago his body had produced these, but now they were foreign cells utilizing her body.
She soon saw what became of her own testicles and sperm, as Eileen's seed reached her retreated ovaries and approached a cell much larger than all of them. Ty felt acutely aware of her repurposed body- she was about to get impregnated by Eileen's seed! The fact their bodies had been the opposite of their current forms until just minutes ago, or even how they consciously felt about making a baby, meant nothing. All that mattered to the cells inside them was the opportunity to reproduce, which they seized eagerly.
Sure enough, she watched his seed swarm around her egg, each and every one wearing away at its outer walls and aching to get inside. Soon, one managed to, and the egg slowly moved downwards into Ty's womb. It pressed its way into the wall of the womb, and settled there, preparing to grow and develop into offspring for Ty and Eileen.
Once her vision concluded, Ty felt Eileen break off his kiss and slowly pull out of her. His excess semen soon began leaking from Ty's pussy, and his still hard cock rested on Ty's stomach. She could see it between her tits as more white juices dripped from the tip.
Her eyes traced up Eileen's handsome, toned chest to his face, and when she saw his satisfied grin, she blushed and grinned back. "Thanks for letting me mate you," he said softly. "You're such a good girl."
Ty felt her heart race as he said that. He knew he'd gotten her pregnant, and he liked it. She had to consider for a moment how she felt about it...