You settle into your chair, feeling your forehead as antlers begin to bud. This was insane! How could Jenny be Prancer?! How could YOU be transforming into one of Santa's reindeer?! And yet here you are, sitting in your chair and watching a pelt of brown fur slowly creeping up your waistline.
Less than a minute after your phone call with Jenny, your doorbell rings. You get up to answer it, hobbling awkwardly along on your new hooves. You open the door to reveal a pair of naked bipedal reindeer women. Their general shape was like human women, but they were covered in velvety fur like yours, their feet sported cloven hooves, little tails twitched behind them, and their antlered heads ended in reindeer snouts. Their arms ended in a strange compromise between hooves hand hands: two weirdly thick fingers and a thumb on each hand, ending in nails made of the same tough, dark substance as their hooves. Human-like hair grew from their heads and spilled like waterfalls around their elongated caribou ears.
One of the anthro reindeer had long, curly red hair that you'd recognize as Jenny's a mile away. You marvel as you stare at this creature that must be your girlfriend. It's strange to see Jenny transformed into this fantastic beast, even though your head tells you that this is who she really was all along. You can't help but feel a little hurt that Jenny (no, Prancer) kept this from you for the entire two years you've been dating, but you can sort out those feelings later. Right now, you're just relieved she's here to help you.
The other anthro reindeer standing next to Prancer has long, silky hair the color of dark chocolate. Her face may be a caribou snout, but her irritated scowl is recognizable on any species. You recognize the second anthro as Danielle, Jenny's sister. You suppose her real name must be Dancer. You only met Danielle once before, and she'd been in human form then. Still, she made a very strong impression. She'd struck you as a very mature and intelligent young woman, but you didn't really care for her sharp tongue.
Dancer looks you over appraisingly. "See what you've done, Prancer? This poor human's probably frightened to death because of your idiotic gift!"
"Yeah, yeah," Prancer sighs, waving her sister off. "I get it, I get it." She then spots you and sprints over to you with a huge smile, catching you in her furry embrace. You blush as her naked furry breasts squish into your chest. "Oh, darling! It's so good to see you again! Ooh, you're really coming along!" She releases you from the hug to explore your changing body. She feels your horn buds, runs her hands along your furry legs, and takes your hooves in her cervine hands. "You'll make a magnificent reindeer!"
"Could've gotten your sweetheart on board BEFORE mailing him magical jingle bells," Dancer grumbles, crossing her arms. "If you ask me, a magical reindeer dating a human in the first place was a recipe for disaster."
"Oh, lighten up," Prancer giggles. "It all worked out in the end." She looks at you. "That's right, isn't it? Forgive me, sweetie?"
"I think so," you tell Prancer. "You did try to tell me what it was. This is on me for not answering to spite you for working on Christmas."
"Like we wouldn't be working on Christmas!" Dancer snarks, rolling her eyes.
"You hush your mouth, Dancer!" Prancer snaps. "If you feel that way, why'd you even come?"
"Because this human's probably going to be my brother-in-law soon," Dancer responds. "Assuming that temptress Vixen doesn't steal him from you, of course." Dancer smirks at her joke.
"Oh, please!" Prancer scoffs. "You know Vixen's dating Cupid these days. Surely you've heard the dreadful racket they make at night." She turns to you. "Don't mind Dancer. She thinks I'm an idiot for getting a human mixed up in North Pole affairs."
"Well, you do have other options," Dancer remarks. "There's plenty of handsome young bucks up at the North Pole. Look how happy Dasher and I are together."
"I'm sure he loves you very much," Prancer retorts, "but that's YOUR life. This man is the one for me, and nothing will change that. Besides, he'll be a reindeer of the North Pole soon enough."
"Fair," Dancer shrugs. "Personally, I'll never understand why you broke up with Comet, but it's your life to live, I guess. Just try not to make an even BIGGER mess of everything." Dancer's muzzle curled into a playful smirk. "And definitely keep your fiancé away from Vixen. He may be a human, but he is handsome."
"Ugh, I keep telling you!" Prancer groans. "Cupid keeps Vixen busy these days!"
"Fair," Dancer laughs. "Those two sex fiends ARE perfect for each other. Just try to keep your future hubby out of any wild bisexual threesomes with them. Remember how they offered to welcome Rudolph onto the team?"
"I also remember that he turned them down," Prancer says with a roll of her eyes. "Ugh, sisters!" She refocuses her attention on you. "Now, to business. The bells are turning you into a reindeer. You'll be stuck like that for a while, but you'll still be able to speak English. You'll be able to learn how to shift into a hybrid shape like the one I'm wearing right now or even back into your human form. That'll take some practice. I'll be happy to teach you once you get settled in. But first things first! We need to get you to the North Pole to introduce you to Donner and his wife Blitzen. They're the leaders of the sleigh team."
"I thought Rudolph was the leader," you remark. "He's always in front."
"That's because he's our navigator, nitwit!" Dancer sniffs.
"Don't mind her," Prancer says sheepishly. "She means well. Really, she does."
"I'm used to her," you laugh. "She was just like this when I met her in her Danielle form. So I'll really meet Donner and Blitzen?"
"You will," Prancer smiles. "And Rudolph. And I have to introduce you to Santa Claus, of course. After all, he's the boss. So, how do you wanna do this? Do you want to finish transforming and fly with us, or do you want us to just go now and carry you?"
"Might as well leave now, Prancer," Dancer says, fiddling with one of her horns as she thinks. "It's not like he knows how to fly with any kind of grace yet."
"That'd be a pretty awkward way for us to fly, though," Prancer counters. "Hard to be maneuverable with my boyfriend dangling under us." She turns to you and smiles. "But it's not our decision to make. It's yours. Do we leave now or once you've assumed your new shape, darling?"