Taylor dangled the remote from two fingers, like it was covered in acid. "I'm not sure about adding or modifying anything about myself, as long as we don't know how much extra is added."
Penny frowned. "Oh, come on. You too?" She kicked off her pants, causing Kate to shoot a look of pointed disgust. Penny turned to her friend. "Sorry, not sorry. Need to walk, and these jugs don't allow pants." Returning her focus to Taylor, she waddle-walked her way over. "Alright, what'll it take to get you to use the remote? Some more tests to see if it works consistently?"
Taylor nodded. "I just...Don't want to pick one, and get twenty."
Penny smiled. "Okay, give me a cow tail."
"What?"
"If it becomes three like these udders, then we can be pretty sure adding one of something adds two extra."
"But what about bigger numbers?"
"We'll get to those later, just do it."
Taylor grasped the remote, and slowly sifted through the options, looking up for reassurance from Penny every few moments. As she finalized the remote's selection, she checked one last time. "Are you sure?" Penny nodded, and the remote was used.
Penny's tailbone lengthened into a thin, ropelike mass as a thin layer of white fur grew along it. At the end of it grew a black tuft, making its bovine roots apparent. Like before, two more buds of flesh expanded from either side, quickly growing to the same shape and appearance. She flicked the tails around for a few moments, but looked frustrated. "I can't really control just one of them. Dang. Anyways," she said, turning back to Taylor, "it looks like you get two free every time you enter a quantity of one. For two, I'm thinking I need at least two more arms."
Taylor looked taken aback. "You want to grow extra arms?!"
"Want is a stretch, but if you haven't noticed I've got twelve teats that'll need milking at the same-ish time. Even if I could get everyone here to help, I'm still short two hands." She gave a short nod toward Kate. "And I doubt everyone would be willing to help with that. So, an extra couple arms would be good."
"Uh...Sure." After a series of clicks, Taylor leveled the remote and fired on Penny a second time.
Penny's shirt immediately started gaining blobs beneath her original arms, but her shirt was covering the formation. She quickly stripped her shirt off, allowing everyone the chance to watch as the mass formed into a small fingerless arm, then grew in size until it matched her natural arms. As before, a third pair grew in beneath this second row, followed by a fourth pair which grew in mere inches from her hips. Without shoulders, the arms looked uncannily non-human even though the skin and features were perfect matches to the original.
Penny seemed to have some issues coordinating all eight of her arms, causing some to flop and overcorrect as she tried commanding each one separately. "Woah, this feels SO weird. Like, I've got a bunch of ghost hands that want to do everything, but they can't because they're not in the right spots." She let all limbs fall limp, then controlled only her two uppermost arms. She carefully grabbed the wrists of her second row of arms, guided them to her udders, then had each grab a teat. She repeated this process until all six of her new hands were occupied, then got her original hands on the last two so her hands fully occupied both her upper udders. "Alright. One, two..." Simultaneously, she squeezed a thin stream of milk out of each teat, causing a stain to appear on the carpet.
Kate looked offended. "What the hell, Penny! Don't milk yourself onto the floor!"
That seemed to snap her out of it. She turned to you as every hand fell to her sides. "Oh my god, I'm so sorry. I'll clean it up!" Devoting a pair of arms to each udder, she held them in place as she jogged to the kitchen, grabbed some towels, and returned to the site. As she soaked them, she said, "Honestly thought I wouldn't get anything out of 'em, my bad."
Taylor was busy looking at the remote as the cleaning was completed. "One becomes three, two becomes six. Maybe it's tripling the number every time?"
Kate nodded. "If we could get a three to nine, then that would be a reasonable guess. But, what on Earth would we add a three or nine to without it getting weird or hard to deal with?"
Penny perked up. "You could add 3 cow horns to-"
Jack interrupted her. "Why not hair?"
Taylor seemed to agree. "Yeah. I could try hair. Can someone get a ruler or something?" She went through the remote, selected hair, put in 3 inches, grabbed the base of some hair follicles and hit herself. It was far less flashy than Penny's changes, but in a matter of moments she went from modestly long hair to very long. After it was measured, the amount grown was indeed 9 inches. "It's tripling the outcome. Probably." She gave a sigh of relief.
Kate spoke up first. "So, what change do you want to make?"