The next day, Beverly went to her lab and studied the blood samples. She also reviewed the notes on the two PEDs developed from horse testosterone and horse estrogen. Eventually she concluded the changes were essentially permanent. Exceeding doses might cause further changes, but for Bill and Megan there was no going back to their normal human forms. Meanwhile, she lowered the recommended dosage and made sure to emphasize how important it was to other test subjects to no exceed it, warning of serious side effects.
At home, Bill and Megan settled in at their new home. As far as their families knew, the two had abruptly eloped to Argentina with no intention of returning. They helped with the ranch and house, trying to earn their keep. They continued to go around completely naked, feeling no need for clothing as humantaurs and not having much that would fit anyway.
Beverly rapidly grew fond of their tenderness toward one another, their playful demeanor, and their positive attitudes about what had happened to them. Despite her nudist housemates, Beverly continued to go around the house in shorts and a shirt. One evening, Beverly was watching Bill and Megan frolicking in the field when their play soon turned to more. The next thing Beverly knew, Bill had mounted Megan and was mating with her.
Beverly couldn't look away. On the contrary one hand almost immediately slid into her shorts. Bill was such a stud and Megan's tits were amazing. She couldn't deny it any longer: she was lusting after both of them. Beverly voyeuristically drove herself to orgasm in the kitchen.
What had happened that evening wasn't mentioned. Beverly wondered if Bill and Megan had realized she had seen them? Maybe they intended for her to see them? But the next morning Beverly came to breakfast as naked as her housemates.
That night, as Beverly lay in bed, she heard Bill and Megan go at it again in the guest room. Beverly got her vibrator from her nightstand. She would never admit it, but she had bought one that reminded her of a horse cock. Beverly lay in bed and pleasured herself to the sounds coming through the wall.