"Sure!" Rachel said excitedly, this was what she had always dreamed of but had never thought would actually be offered. She smiled a little as she gave Melody a nod. "Thank you so much for offering me this."
"You're welcome," Melody said with a nod. "Are you ready for this? I mean, when we do this there's no going back, you're going to be a Unicorn for the rest of your life."
"Melody, you know me, my family barely talks to me, my dating life is non-existent, all I have is my horses," Rachel said as she glanced back at the stallion for a moment. "This is basically everything I've ever wanted... I'll take it."
"Okay, you're going to want to remove your clothing, since Unicorns don't wear clothes," Melody finally said with a soft chuckle."
Rachel didn't need any further prompting as she removed her shirt and pants followed quickly by her undergarments. For a moment she blushed when she realized she was naked, but then again so was Melody. And this was going to be natural for her in a matter of minutes. She smiled a little as she spread her arms and waited for the magic.
Melody smiled as she concentrated on the spell and her horn started to glow as it enveloped Rachel's body. The transformation overtook her quickly as brown-ish red fur grew over her body. Melody couldn't help but watch as the human's body transformed into a beautiful Unicorn mare.
Rachel fell onto all fours as her bones changed into an equine skeleton. Her new horn grew out of her forehead as her breasts moved down her body and formed her teats. Her red hair became her mane as her tail grew out from her rear.
As the transformation finished its work she looked back at herself and let out a happy whinny. "Wow, I look amazing!" She said as she nuzzled Melody gently. "Thanks, Melody."
"You're welcome," Melody said with a soft smile as she sniffed a little and smelled Rachel's pheromones.
"Ohh... I feel so horny..." Rachel said with a groan as she lifted her tail a little. "The heat is so unbearable..."
"Sorry, I should've warned you about that..." Melody said with a shake of her head. They didn't have any Unicorn Stallions here, so there were only so many options as Rachel shuddered again.
Melody looked back towards the Stallion who was staring at the Unicorn who used to be his mistress. He was already getting an erection, that was certainly an option but not the best one given the results of a Horse and Unicorn mating could be very unpredictable. Sometimes they gave birth to a Unicorn, but more often than not it resulted in a normal horse.
There was, of course, another option, Melody could alleviate the heat at least for a time, but she had to choose fast.