With a thick coat of fur under her clothes, Lina quickly became hot in the musty store. It didn't help that she was feeling very aroused at this point in her transformation. She had to resort to panting through her mouth in order to keep cool.
Amy seemed to have noticed this, as she led Lina to a vending machine. Obligingly, Lina continued to pant as she pulled a dollar bill from her pocket. Amy shook her head. "Nuh-uh, this is on me. Why don't you go sit down and cool off?"
Lina was too happy to oblige, and walked limply over to a nearby chair. It didn't seem to have any freakish attachments on it, and while Amy conversed with the vending machine, Lina was preoccupied with trying to guess if the chair even had any unusual properties at all.
Lina had hypersensitive dog ears now, but since she wasn't paying attention, she didn't notice when Amy responded to the machine's request to input a species with "Bitch." In a moment, she was returning to Lina with a bottle of mineral water in her hand. Lina eagerly gulped down the refreshing liquid.
"Thanks," she said, standing up. "I'm feeling much better no--woah." An overwhelming heat suddenly sprang to life inside her. She sat back down immediately, panting even more heavily than before. "Wh...what did...you...do?" she asked with a frightened look at Amy.
"It'll burn for a minute," Amy said, petting Lina on the head. "But you'll be fine."
Lina couldn't talk anymore, with her panting taking up too much energy. Now it felt like her chest was boiling and frothing, getting ready to burst open. That's when she noticed her breasts inflating. She grabbed them in her hands, squeezing them in the hopes that she was halucinating due to the heat. They pushed back on her hands as they surpassed the bra that held them and broke its straps apart underneath her shirt. Now more bulges were forming through the fabric, and Lina realized that she was growing extra breasts like Amy.
Because of her high-cut shirt, only four breasts were obscured from sight. Four more nipples in two rows grew on her visible furred chest and the flesh bulged out. "Wh...hhh...eight?" Lina panted, probing the growing mounds with her fingertips. They were hot and very sensitive in this newly emerging state. Amy sat right next to Lina, holding her around the shoulder, as surprised as Lina was that she was growing one extra pair than she had.
When it was finally over, Lina threw off her shirt and broken bra. The two girls marveled at the four rows of breasts, with the top two larger than average and each row getting slightly smaller as they went down. The final pair had formed just above her waist, meaning her entire front from chest to belly was punctuated by firm, furry breasts.
"May I...?" Amy said hesitantly, reaching out a hand and staring at the mounds.
Lina, still panting from the heat of her transformation, said "Me first." One by one she cupped the breasts, feeling their weight and soft warmth. By the time she had finished, her body had cooled back down. Amy touched them delicately once she was allowed to, and when her hands came to rest on her top pair, Lina held her own hands against Amy's, pressing hers into the golden fur.
"Yours are bigger," Amy whispered.
"I wonder why I have eight?" Lina whispered. "And you have six?"
"The machine makes a unique drink for each species. Maybe because I didn't specify that you were part human, it gave you as many tits as on a real dog?"
"Do dogs even have eight tits?"
Amy purred over the question. "I don't know."
They sat there silently for a moment, reflecting on their changes and taking in the new sensations--not only from their bodies, but from their emerging sexuality that had remained heretofore unspoken between them.
Amy shot up suddenly, pulling Lina to her hind-paws as well. "Well!" she said. "Time to finish the job!"