“You ready?” Joe asked his twin.
“Yeah,” smiled Sarah. “Can we start with my ass?” She asked her brother who raised an eyebrow. “I mean I already got a breast tail so why not get breast butt cheeks?” She rhetorically asked.
“I think that’d be very interesting,” Naomi truthfully told her boyfriend. “I mean why not?”
“Alright Sis,” Joe beamed, “Turn around and drop your shorts and get ready.” Joe picked up the Black Breastinator in his right hand. “Just one question; how big should these be?”
Sarah crossed her arms and tilted her head in thought. “How about the size of soccer balls?” Sarah straightens out. “You know like 20 inches in diameter.”
“I think that’ll be a good start,” Joe told her. “But first can we lock my door?”
Sarah quietly laughed and turned around to lock the door. As soon as she did that Joe spoke up, “Let’s get started.”
Sarah nodded and grabbed her shorts, “Ah Joe can you help me drop my shorts?”
Joe nodded and put down the Breastinator for a bit while he helped her slipped her shorts off and around her tail breast. “You know having a giant breast like this isn’t very practical.”
“Neither is having a set of two foot round breast balls with a breast dick and two one foot round breast butt cheeks.” Sarah remarked.
Joe’s face fell as he finally got his Twin’s shorts down, “Whatever,” he retorked back. “Well are you finally ready?”
“Yep,” Sarah beamed.
“Alright,” Joe laughed, He then picked up the gun and took aim at his sister’s left butt cheek. “Let’s begin.” Joe then pulled the trigger to hit his sis. Joe watched his sister gain a new nipple on her left side which took the small color as her other nipples. It then grew out a bit as it grew along with her ballooning out of her newly forming breast butt cheek. Joe watched it hit the B cup rang fast with a well sized nipple sat dead center in the middle. The newly formed breast started to fill up with breast milk as the liquid forced the breast to grow out past the D cup range where it started to get spherical. Soon it hit the average size of a soccer ball. At that point he stopped holding onto the trigger.
Sarah looked over her shoulders and looked at her newly formed breast butt cheek. “Joe can you do the other one?” She asked. “It’s a bit weird only having one half of a matching set.”
Joe laughed a bit and then stepped around her massive tail breast to take aim at her right butt cheek. Then he pulled the trigger to watch a brand new breast grow out on her right side. Like the first one, its nipple grew out on the dead center of the tit and filled with milk as it made it past the D cup range. Soon Joe let go of the trigger to have his twin gain a matching set of milky breasts of the same time. Sarah then took a moment to grip both of her Breastified butt.
Joe took in the new sight of her sister behind. Her white panties covered half of her big nipples on her ass cheeks and her naked giant tail breast wedged in-between was quite different. “These are perfect!” Sarah squealed. She turned around to face Joe face first. But as she did her new enhanced booty danced and swung around as they collided with each other and her tail breast.
“You know,” Joe spoke up. “How are you even going to use the bathroom?” Joe looked concerned. “I mean your tail breast must get in the way.”
Looking unimpressed Sarah starred at her twin, “Have you seen the bathroom before I was one of your breasts for the day?”
Joe blinked and thought about it, ‘Good point. It looked custom made for us.’ Joe sighed, “Alright I see your point.”
“So what’s next?” Sarah asked.