In Sara's locked bedroom, things were getting red hot. Moments after seeing the first hints of Toy's horsehood, Sara held him tightly against her naked body, having torn off her clothes. Now she and her anthro unicorn pet were in a passionate kiss, exploring and fondling each other's aroused bodies. Pressed into Sara's stomach was the unicorn's large black penis - nearly as thick as a plump sausage and as long as her forearm. It throbbed between them, leaking a little precum in excitement.
"Ohhh..." Sara gasped, her body tingling madly. "This feels so good, Toy... so good." She groaned as they broke their kiss and she placed her hands on his strong furry shoulders, gripping him tightly. "I-I'm aching all over... so horny." And suddenly, she grew bigger.
"My... lady..." Toy's eyes widened. "Y-You're... taller!"
"W-What?" Sara opened her eyes dreamily, staring at his face. She blinked, and her expression turned to shock. "Wait... I am!" She stepped back, looked down at herself, looked at Toy, and then her mouth went slack. "Yes, you're right! I am! I'm taller!" She stepped back in and compared their heights, found that she was as tall as if not taller than her buff unicorn. That would place her above six feet tall!
"Joe..." She whispered. "He... he must have wished something for me."
She gulped, felt the warmth boiling through her now, and realized she was transforming. "Oh God..."
"S-Should I get help, my lady?" Toy looked on nervously, not sure what to do.
Sara's eyes lit up with sheer delight as she saw herself changing. She had gotten taller by several inches now - was still slowly growing - her muscles were firming and expanding - her breasts were swelling up - and - and... "I'm fine, Toy." Sara looked *down* at her unicorn now, marveling as her ears grew pointy and began to expand.
She looked her unicorn in the eyes, grinned at his bewildered expression as he stood with a solid throbbing penis, and felt her neck crackle a bit as it began to lengthen. She was sprouting gold and brown fur markings all over, and her feet were turning to hooves.
As moments more ticked by, the changing giraffe woman who had previously been Sara the human got taller and taller, her long blonde mane of hair falling like a river down her two foot long neck. Her face grew out into a muzzle, ears blew up into big pointed ovals, horns sprouted from the top of her head. Her muscles and tits swelled further, her height surged, and her lean but muscular body stretched and stretched into a lanky but powerful frame.
She gasped as the changes tugged below, lubed up her pussy, and a tail burst from above her ass, lengthening and growing into a beautiful long appendage with thick blonde fur at the end. Her toes merged, grew, turned to cloven hooves, and her heels raised.
Her head brushed the ceiling, she kept growing, fur getting golden and latticed with brown, thick and plush. She gasped, gritting her sqaured off plant eater's teeth, and then her *shoulders* brushed the ceiling. She was truly massive and muscular. Sara sat down on her bed, lost in the process, and felt her weight pressing down the matress as she achieved 18 incredible feet tall, now a huge big breasted and muscular giraffe anthro.
She panted, long blue tongue dangling, and looked down at her positively tiny looking unicorn. "Oh, Toy... what do you think?"
"My lady..." Toy gasped, blinking. "Y-You're... so... big. How could I please you now?"
"Silly boy." Sara grinned. She reached forward with one long arm and brushed her animal's cock with long dainty fingers. "You're big where it counts."
The two of them grinned, drew closer, and renewed their sexual escapades as two willing animals.