Liam slid deeper and deeper into Santa's magical sack. The inside was silky soft, and so smooth it became too slippery to grab onto.
The spoiled boy flailed as he slipped and tumbled down the impossible tunnel. His pajamas slid off his body and vanished into the red velvet twists and turns, leaving Liam stark naked.
Then out of nowhere, he landed at the bottom, atop a long, blank pillow. There were no presents down here. Just Liam upon a white pillow at the bottom of the impossible sack.
The pillow was slightly longer than Liam's body. And it was very comfortable. It had no zipper or pattern on it. Just plain white.
"Hey! Let me out of here!" Liam yelled, but there was no reply. He sank back into the comfy pillow to nervously wait. Despite his predicament, the pillow was so comfortable against his nude body that he found himself soon barely able to keep his eyes open.
No! Mustering his will, he went to sit up. He couldn't afford to fall asleep now. Or at least he tried to sit up. Looking down, he saw he'd fused with the pillow. Or rather, his naked body was simply printed onto the pillow's surface. He was the pillow. And his naked image was frozen in a depiction of surprise.
The sack moved a bit, and the Liam body pillow tumbled over, revealing a black side again. But oddly enough, Liam felt like he was still facing up, despite having no face or anything printed on that side.
The sack shifted again, and Liam rolled back over, only this time the pillow was black once more. Liam's vissage had been erased. But he was still inside.
A large hand reached down into the sack and pulled him out. Santa looked at the plain body pillow.
"Let's test you out... Hmmm... I wish you were a cute Christmas elf girl." He flipped the pillow over, revealing an image of Liam on the new side. But as an adorable chrismasy wifu with big titties barely hidden under a green elf gress.
"Raindeer girl" Santa said, flipping it again. Now Liam was a the same cute girl, but in a revealing raindeer getup. Santa felt the boobs, and as he closed his eyes, the tits felt real. Firm breasts with erect nipples. And he could have sworn he could hear someone faintly moaning. But as he opened his eyes, all he saw and felt was the pillow with the girl on it. Though the girl's face seemed more red and lustful now, and the dress had shifted, letting the tits pop out, revealing perky nipples.
"Bondage boy" Santa said, turning the pillow yet again. This time, the image was of Liam again, looking confused and scared while tied up naked.
"Butt facing me." Turning Liam around, he found the same picture, but from behind, with Liam looking back over his shoulder.
"My finest gift yet," Santa said with a jolly hoho. "Now become a Christmas gift with instructions." Santa turned him about again, revealing a red body pillow with a green ribbon printed on to it, and golden text spelling out,
"Marry Christmas! This magic body pillow will take the apparence of whatever fantasy you tell it. And it will feel real. Simply speak your desire out loud and flip the pillow. Have fun. Oh, and feel free to cum into it. The pillow will self clean."
Santa then silently carried Liam into some bedroom and lay him down next to a sleeping form to be discovered in the morning.
Internally, Liam was struggling with all his might. From his perspective, he'd blinked while being flipped over, and suddenly been back on his back and had the body of a cute girl. Then a girl on her back again. And what had been with that groping!? He'd hadn't meant to moan. Why had that felt so amazing!? Being a girl, then a boy, then a present had really confused him. He wanted to tell at Santa not to leave him here like this. To turn him back into a human. But he couldn't move. He couldn't speak. He could only lay there and please whoever chose to use him. He wondered who Santa had given him to? He'd have to wait until morning to find out.
Being a literal pillow was very comfy though. He felt like he was drifting atop a cloud. Within a minute, Liam was fast asleep in someone else's bed.