Jenny looked up at Chad with watery eyes, showing him that his attempts to understand the situation were only making it worse. He was about to say something, when he was cut off by the feeling of something growing against his chest. Two somethings. He looked at Jenny, and saw that her breasts, which should have been A cups, were slowly inflating outwards, straining her clothes along with her new height. Jenny's upper lip began to quiver, despite the warm sensation that the growth was giving her this time, as her breasts reached B cup size and co to use to grow, her nipples showing through her school shirt.
Chad knew he had to tread carefully. Was it any mention of her size that made Jenny grow, or just the word "bigger"? He saw Jenny's growth slow down as her breasts entered the C cup range, and her growth finally came to a halt. Chad examined her for any other changes, but found none, other than the fact that her already over stretched school shirt was sporting several small tears and rips. Jenny began to cry, so he took her up to her room, as the kitchen wasn't a very good place to console a taller, bustier, little sister.
"Jenny," Chad began, choosing what to say carefully to avoid any more growth, "Is...getting taller-" he quickly checked she was not growing again, which she was not, to his relief. "Is getting taller, and, uh...a bit bustier, really that bad? You know, it happens to all girls eventually. Just not so quickly." He said, and Jenny gradually stopped crying into the tissue he had provided, although she was still sniffling. "And besides, wouldn't it be cool to be taller than mum? And me?" He asked, noticing an aweful and hopeful spark in her eyes. He sat down to his now 5'6" sister on her bed, absent mindedly noting the sheer amount of pink in her room, and embraced her in a hug, which she gratefully returned.
"Thanks, bro. But... Can I ask you a question?" Jenny said in a quiet voice. "Sure" Chad responded warmly. "Can we make me grow again? It felt funny but good." Chad debated his options for a second. She was probably going to grow anyway, so he might as well be the one to make her grow. "Alright, then. Bigger."
How does Jenny grow?