She rides him

Emily then got on top and sat down on his still hard dick. She then started riding him hard. "How is this for proof?"

Kazex moaned happily holding onto her hips tightly. "That'll work!"

She smiled down as she rode his dick hard. "My research.....should be done.....by the time I birth this next batch. AH! I should be gone for......a month at least."

"fair enough. Fortunately, our firstborns will be of age soon so I can have our daughters to play with while you're gone."

Emily giggles. She also thought of her firstborn sons. They would take after their father and his huge dick. It was weird having sexual fantasies of her own children but it turned her on so much. Soon they both came at the same time as Kazex's seed flooded with waiting womb again. She screamed happily in pleasure as she felt him filling her again. She then rolled off to his side.

"I love this so much!" Emily said happily before drifting to sleep with Kazex nuzzling up to her breasts.