Christy followed Brooke until she entered the outdoor bathroom next to the pool. Instead of going in too, she went around and climbed in boxes and peered out the window.
Brooke already had a condom on her dick and was jerking off furiously. She came quickly filling the condom with her cum.
Christy was watching Brooke, who was trying to figure out why she had a stick now, and had an idea. She fired again and Brooke's cock grew to 20 inches, her balls quadrupled in size and darkened, ending with the skin of her cock receding almost everything leaving all of her new cock exposed in the air.
Brooke just looked horrified as her cock turned into a horse cock, being too big now for the condom she was using and completely destroying it. She was confused because along with the horror of what was happening to her, she was also getting more and more excited making her cock harder than ever.
Both Christy and Brooke were taken by surprise when someone else suddenly entered the bathroom and caught her in the act. Who had just come in was the centaur stallion Madison.
"You are there Brooke, I was looking for you. You and Christy should have been practicing with the others but it was taking too long to show up, so I came looking for you. Haven't you seen Christy around?" Madison said
"I don't know anything about her. I already have too much concern because a cock grew out of me out of nowhere and now it has turned into a horse cock." Brooke said
"And what's the problem with having a horse cock?" Madison asked
"It's all wrong with that. I'm a girl and human, I can't have something like that between my legs." Brooke said
"No problem with that, I know you’ll like it." Madison said
"You only say that because your bottom half has been a male horse since you were born, you can't understand how I feel." Brooke said
"I know you will like it anyway and I can help you with that. To tell you the truth, I was also a little excited and we can do that right now." Madison said and turned her back on Brooke before saying "Come on, fuck my ass now."
Brooke tried to resist the temptation, but the desire was very strong and she instinctively pushed the tip of her cock into Madison's ass, making it enter in and slowly. As much as she tried to deny it, she was enjoying fucking her centaur friend's ass, fucking energetically until she came just before Madison.