Brooke took a deep breath and looked at the screen. Sam glanced over nervously, excitedly, as she savored the little kiss on her scaly lips. It sent a flush of excitement to another set of lips in a more secluded area of her body.
“Brooke...” Sam whispered gently. “W-What are you going to do?”
“Nnnnh,” the deer moaned nervously, sheepishly, absolutely terrified. “Actually, I’m not sure that I’m ready to like... change somebody. But... I guess I know what you’d like from me now.”
A sudden rush of courage hit the doe and she looked over at Sam with a screwed up smile. The iguana gasped in the driver's seat and recoiled at the clear expression on her friend's face.
"Wait!" The iguana blinked her lovely green eyes. "What are you-"
Sam let out a gasp of shock as she actually tapped the on screen button. Her friend jolted next to her and whimpered. Her body, her clothing, her leather headband, all of it suddenly began to shrink in size.
"Oh God!" Sam cried, whimpering, squeezing her thighs together. "You're shrinking me! You're shrinking meeee!"
"Yeah?" Brooke stared, glancing down at the screen nervously and the progress bar that was barely an eighth through.
The iguana continued to shrink, trembling as she dwindled away in her seat, head and back spines sliding down the headrest and trailing down the front of the seat. She stared at herself in shock and wonderment and then back at Brooke as her head reached just the middle of the leather seat. "Jesus, Brooke!" The lizard squeaked, voice raising in pitch by the second. "H-How small did you make me?"
"Small." The deer blushed deep tan on her cheeks. "Very very small."
"Brooke!" The iguana cried out, suddenly standing on her feet in the middle of the soft padding of her seat with room to spare. "I-I've never been this little before! How far did you..."
The deer licked her lips and grabbed her bestie in both arms, eliciting a squeak from the shrinking lizard as she hoisted her muchly reduced body onto her lap. Sam stared up in shock, her neck pressed into the deer's now enormous tits, and found herself lifting her head up to see over top of the cleavage to the deer's grinning mouth.
"Oh God." The iguana trembled, Brooke's fingers closing around her slimming waist and picking up right off the seat, legs dangling. The doe glanced at the glowing screen from the seat and Sam did the same, seeing the final height she was destined to become and squirming.
"Brooke!" The iguana squeaked in disbelief. "That's too small!"
"Nah." The deer chuckled. "Call it payback."
On and on the reptile woman shrank, closing onto twelve inches tall and surpassing it in her furry friend's hot palms. She squirmed in shock as she fell to six inches. Then three. Then... much less.
Brooke held up her hand carefully and saw the faintest outline of a centimeter tall iguana. She stared at the dot and probed at it with her other finger. She saw Sam raise her arms up and only distantly heard her cry out, barely audible to the now giant deer's sensitive ears.
"There. We're even." Brooke whispered, seeing the iguana tumble to her knees and grab herself in fear under the fluff of Brooke's palm. "Don't worry, little bestie. I'll grow you back."