"Zoey is extremely well developed. Her body went through what doctors call early onset puberty and she now looks like a high school student. She is also very tall for a girl, standing at 6'3 and also her breasts are much much larger than they were before. Zoey also has a habit of going around without a shirt on and even loves when people look at her breasts. Mom and Dad have given up on forcing her to wear a shirt or bra and just accept their daughter's voyeurism."
He was about to let go of the button when his erection got the best of him.
"Zoey also loves to let me touch, rub and even suck on her enormous breasts. Infact she gets alot of pleasure out of it whenever I do so."
He finally released the button as the spark went off and he heard Zoey moan a little behind the door as her body grew and adapted to his new changes. He couldn't wait to see her and he opened the door and gasped at how sexy his little sister had become.
She was leaning over the couch in her room, wearing skin tight pants which hugged her legs and butt but she was topless from the waist up. She looked over at her brother and smiled. ( https://i.imgur.com/fF8Nzn8.jpg for reference ) She straightened up and walked over to him, her now enormous K cup breasts bouncing and wobbling with each step. Her nipples pretty large and erect from months of letting Arthur suck on them.
"I can't wait to study, but i'm sure you wanna play with my big breasts huh big brother?"
She was now standing a full head taller than her older brother, and smiled as Arthur placed his hands on her sensitive breasts. She cooed and moaned as he rubbed and caressed her massive breasts. She soon he had his head in her lap and she was leaning her breasts to his mouth for him to suckle as she read her text book. She let out an occasional coo and moan as he did. She had been studying like this for a few months, letting Arthur lay in her lap as he suckled on her breasts as she studied. Arthur thought to himself the only thing that would make this better is if she was lactating. Maybe later, he wanted to enjoy being able to feel and suckle such a large and heavy breast for the time being.
After an hour like this, he decided he needed more. He got up and went into the bathroom, pulling out the dictaphone.
"Zoey and I have been lovers for awhile now. Our parents know but they are actually supportive of our relationship to the point they converted our room into a double room. Zoey is also even bigger and bustier...7 feet tall, and her breasts are much larger. She is also growing bigger every day without defect. She is also lactating from all the stimulation I have given them and she is always full of milk for me. Zoey is also addicted to my cock, she will always love to give me a blowjob whenever I want or fuck whenever I want. I can also cum multiple times and my cock is big enough to fill her completely."
He smiled as he returned to his room which now belonged to both him and Zoey. The wall that once separated their rooms was now gone and there was an enormous bed. In it laid Zoey now 7 feet tall and her breasts nearly obscured her entire torso. She was as usual topless and smiled as her brother walked into the room. She licked her lips a bit as she noticed the growing erection in his pants, unable to wait to taste his yummy cock and get his delicious cum all over her tongue. Zoey was in the middle of a growth spurt and had recently grown a full 5 inches to put her at 7 feet. She was loving how she towered over her classmates who the 2nd tallest was 4'11. She especially loved how she was almost 2 feet taller than Arthur, her brother and boyfriend.
Arthur climbed into bed and she immediately leaned into him and kissed him on the lips. She was so happy when he kept his promise even tho she was just a kid when they made it. When she was 6, and he was 10 she asked him if she could be his girlfriend and wife when she grew up. When she was 10 and started growing, she reminded him and he told her it would be fine. Last month, they told their parents about their relationship and at first they were shocked but then grew to accept the idea and even offered to convert their room into a double.
She sat up and Arthur could swear he heard a sloshing sound coming from inside her breasts. Zoey cooed as he leaned down to her nipple and began to suck and was rewarded with an ample flow of milk onto his tongue. She loved her brother so much and loved how much he enjoyed her body. It wasn't long before the two of them were naked and he was thrusting hard into her, bringing her to orgasm after orgasm with his now 14 inch erection. After his 4th orgasm, he was spent, laying ontop of his girlfriend and falling asleep.