Before the giraffe can say much else, you take a moment when she has her mouth open and quickly dump the whole vial into her maw. She sputters in surprise, gulping down the potion entirely, and goes wide eyed.
"W-What in the..." She looks over herself and seems a little freaked out. "I-I'm tingling... all over..." She looks at the empty vial in your hand and goes wide eyed. "You didn't! I thought we had to be careful!"
"Sorry... I couldn't wait." You say in embarrassment. "Just try to be quiet."
"Oh, easy for you to say, buddy!" Quite suddenly, she gasps, closes her eyes, and stretches out to stand. Amazingly, she's a little taller than she was last time she was standing, and the both of you notice this. It's hard not to, because she's still growing!
"Whoa!" The giraffe realizes, watching as her head rises up and up. "Aren't I tall enough already?!" It becomes clear what's going on as you both see her back legs lengthening dramatically. Her front legs seem to snap suddenly as her joints alter, and she tilts forward with a wobble. "Oh, geez!"
"It's working..." You whisper, watching with delight as the middle of her torso suddenly cinches and her thighs point backward sharply.
Her whole point of balance shifts and suddenly the giraffe is standing on only her back legs. She sways uneasily, her head brushing the ceiling on her long undiminished neck. For a moment she looks like an absurd cartoon character, but quickly her proportions start settling down. She grows a little less lanky, her front legs start to take the shape of human arms, and her ridiculously long back legs get a little more supportive as they thicken up. Her natural animal body would seem to be quite strong, or at least fit, because the emerging giraffe woman as tight and toned. Her big thighs merge into ample buttocks, and as she gets used to being bipedal her front hooves start to split into dainty fingers.
"Oh God... look at me!" She gasps, testing out her new hands and flexing them. "Look at meeee!" She whispers, half laughing.
You share the amusement, and something else, as the nipples fade from her waist and two breasts begin to swell from her chest. She seems to shrink down somewhat, perhaps matching her old height (a little more), as she turns into a perfectly formed anthro giraffe woman. And while her long neck makes up a good deal of her height, it is her long sinewy legs that command the most attention. They are shapely and nice.
"This... this is awesome!" She says excitedly. "Look at this!" She waves her arms, poses, does a few jumping jacks, clattering her now huge hooves, and stretches this way and that, demonstrating her extremely flexible new body. All 14 feet of it. You stare in awe, and she looks down at you with a smirk.
"Well, clearly, you like what you see." She grins, and crosses her arms.
"Huh?" You stare, and realize you have a raging boner in your pants. You blush deeply, and stare up at the big smirk on her long sexy face.
"Well..." She whistles innocently. "Nobody can see us." She peeks out the shed door, sees her kin gathered around some tourists being fed. "The keeper's already fed us. Won't be around for a few hours."
She looks down at you again, chuckles, and does something ridiculously hot. She reaches between her legs, spreads her beige lips apart, and spreads it so you can see her glistening wet pussy. "And I am kind of feeling the same way..."
"Oh. My. God." You gasp at the display.
"Well, those are the consequences for doing this to me." She giggles, bends down and lies down in front of you. "Come on... lemme put my tongue to good use."