"As you wish, Mistress," said Jeffrey.
"Good," said Julia. "Now, follow me."
Soon, the two were in the Master Bedroom.
"Now," said Julia. "Disrobe."
Jeffrey removed his clothes.
"Good body," said Julia, as she removed her own clothes. She stepped up to him, and licked his face. "Hmm, A-Grade, bordering on Prime. Ever think about breeding with some of the mares to continue your line?"
"I've never felt the urge to do so," said Jeffrey.
Julia smiled. "Let's remedy that."
She walked over to a dresser drawer, opened it, and pulled out a special collection vial.
"How does this work?" Jeffrey asked.
Julia grinned, and inserted it between her legs, up her vagina. "Simple, we just have sex, and the collection vial will store your genetic material. After this, we'll insert some of the material in a likely female, and hopefully they'll end up pregnant."
"As you wish, Mistress," said Jeffrey.
"Of course, since you're the slave, you must stay on the bottom, no matter what," said Julia.
"Understood, Mistress," Jeffrey said, as Julia motioned to the bed, and he got on it.
Julia then got on top of him, and started mating with him, the vial soon collecting Jeffrey's genetic material.