Mary's bovine brain smelled a female in heat. It didn't matter what species. Cow, mare, as long as it was ready to go, she'd fuck it. Mary approached the mare, and stuck her big tongue into its folds. Sara shivered, and felt her horse meat rising. Mary continued to eat her out, until Sara turned her around.
"It's your turn my little heifer." Sara crooned. She stuck the head of her cock into Mary's asshole. She didn't slide it in immediately. She just teased Mary, jabbing at her hole like she was going to impale her, but never doing so. Mary cried out in need every time. The heat she had on her body was growing with each poke and prod. She couldn't wait much longer.
Sara decided that was enough foreplay, and she drove her cock home. Straight into Mary's waiting vagina, where it was slick with woman fluid. Mary mooed as she was filled up. All the way to her breasts, her stomach bulged as Sara pressed the base of her penis to Mary's outer lips.
They both shuddered, before Sara pulled back and then rammed back into Mary. Danny felt himself getting hard, but kept his mind on his work. He didn't have the lust those two had, though his genitals were that of a bull's. And he'd been doing this longer than the others, he had more self control.
Sara and Mary kept thrusting back and forth until finally they both came. Mary's body shook from the weight of the orgasm, and she once again lost consciousness. Sara took a few deep breaths before stepping back to admire her work. Mary's vagina, black and thick, looked spent and hung out of her lips. Sara wondered how good Mary was, being a new subject and a bit inexperienced. She'd have to ask Danny later.
Right now she could only think about getting cleaned up, and going on with her day. There were plenty of other subjects out there who'd need to find some source of release.