"Could I get the fours in here?"
Quietly, the two smallest of the giraffe folk crept in. "You wanted to see us?"
Ty smiled and picked up the female first, setting the two-and-a-half-foot anthro down on his knee. "Now, aren't you cute?" he whispered into her ear. "Look at you, so small and adorable. Let's keep that. You're going to age down to just 10 years old. Feel those years sloughing off your body. Back through puberty, feel your breasts becoming smaller and smaller. Your vagina shrinking. I could barely fit my finger inside you.
He watched as the already small girl grew smaller. Down a whole foot to just 18 inches tall, the young girl looked bashful just to be sitting on Ty's lap. Her bust shrunk away to nothing, and she ground her groin into Ty's leg as something similar occurred to her prim little pussy. She gave Ty a wide-eyed stare with adorably large doe eyes.
"That's it," Ty soothed her, rubbing his fingers down her back. "You're a tiny little Kordofan, aren't you? Helpless, frail, and bashful. But underneath all that, you're really a pervert, aren't you? You love thinking the dirtiest thoughts and have the sluttiest desires. But you're still just a small, young girl. What do you say, Luna?"
Underneath her fur, the newly-named Luna blushed and ground her pussy just that bit harder into Ty. She cried out, gasping like a child in a high pitch. "Gah! Yes, I'm such a naughty little girl!"
"And you need a big, strong man to protect you, don't you?"
"Y-yes~" Luna whimpered.
Ty beckoned the male Four closer. "Do you see your little girl, how she squirms in heat? You want to help her, don't you?"
Four nodded wordlessly.
"You want to protect her, and keep her safe, and sate her every need, right?" Ty smiled. "You can. Feel yourself growing larger. You're thick and huge, but not defined muscle, like a bodybuilder. You're covered with a soft layer of fat to snuggle into at night, but the muscle underneath is rock hard. Both of you are 10x stronger than normal, too." Four groaned as his body grew to 3'2, more than double the size of his mate, and became solid and bear-like. His pale, silky fur covered a perfect dad bod, strong and dependable. He reached out and took Luna from Ty, holding her against his body as she wrapped her thin legs around his waist and clung on tight.
"But Luna is an insatiable creature, isn't she? You need a body that can serve those needs properly." With a thought, Four's shaft began to stir and come to full erection. Four inches. Not bad, and would certainly fill Luna up, but Ty had bigger plans. Luna stared at the cock hungrily as blood pulsed through it, and Four groaned as it grew bigger with every throb. Five inches, six. It was a third of Luna's size, but she wanted more. Her thighs clutched it hard, squeezing it in ways that made Four's hands claw at her back as he growled in deep satisfaction. Seven, eight, nine, ten. The cervine shaft exploded past eleven and became a whole foot long, thicker, and larger than the boner that Ty sported on his own body.
"How does it feel, big boy?" he asked, grinning wide.
Four groaned. "God, it feels so big and powerful, like I could just split someone in two with this!" His head tossed back and he thrust his pelvis forward. And then, he moaned as his already immense cock began to swell even more. A divot formed down the center as two sides began to pull away from each other, rending a canyon in the massive dick, until POP! and suddenly, Four was sporting not one, but two thick giraffe cocks.
"Oh, Daddy, please, I want them in me!" Luna breathed, eyes blown wide as the 10-year-old found herself staring down two rods that dwarfed her entire body.
"Nghh, sweety, I don't think they'd fit!" Four ground out, as Luna stroked her hands down their lengths. "I don't want to hurt you!"
"You won't," Ty promised. "Luna, you can feel your body becoming elastic, able to fit any insertion into your mouth, ass, or pussy without any pain whatsoever. Oh, and you'll just absorb any cum he gives to you, which is going to be a lot, seeing as he has four huge balls to take care of."
Luna squealed as her hands found Four's testicles, and how large they were. Her mouth slipped around the head of one of his cocks as she hugged it with her entire body, and her jaw stretched impossibly side to fit the uncut glans into her throat.
"What do you say, Hugo?" Ty asked, naming the new giraffe. "You going to fuck your little daughter's brains out?"
"Oh pleeease, Daddy, please," Luna begged, slobbering all over him. "Fuck your dirty little girl?"