Although it was possible to inquire over possibly millions of mythological options it was the Centaur that really peeked Rachel's desire, having loved horse riding since as long as she could walk yet at the same time often wishing to experience the joy of running from a horse perspective, this option actually provided the combined aspects of both.
"I'll be a Centauress please" Rachel answered, "oh... very interesting choice, very few female guests actually take that option" the receptionist remarked "well... with further ado let's get started, so please strip naked."
Rachel privately agreed that was reasonable, no ways clothes could withstand the process, so as instructed she removed all of her garments while the receptionist walked away for a moment before returning with an injection needle.
"Just so you know the transformation can be...a little extreme in pain terms in cases like this. Still I can't stop unless you back out" the receptionist stated, "I understand... so just inject" Rachel agreed with the receptionist doing so right away.
Suddenly it felt like everything below her waist was on scorching fire, so instance Rachel was brought to her knees, at which point the added feeling of her rear growing it mass and pushing out was felt.
Before she could try and turn to see if anything else was happening Rachel then felt her legs thinning yet growing in muscle strength while a second pair started to emerge from the end of her extended rear that defiled logic by from in their own crocheted position.
then Rachel's front feet shrank away and were replaced by hooves while hooves also form on her back legs, things finishing with golden yellow horse hair growing all over Rachel's body below the waist as a tail matching her haired sprouted from the top of her new horse hide.
"you...you weren't kidding" Rachel gasped as she got up, "its based on the logic of adding limbs and muscle by comparison, most transformations merely alter existing ones to match, which small animals instead get the pain in lesser form when reverting" the receptionist explained "anyhow without delay could you head outside, get yourself acquainted with the area and allow other guests to use the building?"
Rachel dose as instructed, hoping to encounter Cynthia along the way to finding the Centaurs...