Super Little Sister (non futa)

Sorry for a non futa story here! Just thought I'd test the waters a bit with this one. Let me know how it is. Thanks!

Will had always enjoyed having a cute little sister. Elizabeth was 6 years younger than him, so they had never been competitive as siblings closer in age tended to be. Instead, he gave her piggyback rides, played board games with her, and let her fall asleep on his lap during Disney movies when he babysat. When he left for college away from home at 18, he looked back her waving goodbye for the year. Liz sniffled and choked down her tears. She was scrawny, short, plain, and hadn't made much effort to make friends at school because of her reliance on her big brother. She knew the year was going to be a rough one for her.

Will didn't really think about his little sister much, his first year at college proving extremely busy. When it was almost time for summer break, his mother sent him an odd email. “Dearest William, just so you know before you come home, your sister has changed a lot this year. Don't be too surprised! xo Mom” He hoped his sister hadn't turned into a punk, a goth, or something else that would mar her innocent cuteness. What he found when he returned home was far from the possibilities his overactive imagination had constructed on his plane ride home.

“Welcome home, Big Brother!” An absurdly attractive girl stood in the frame. She stood 5'7 tall with flowing blonde hair, her voluminous bosom filling the doorway as it stretched her t-shirt to breaking. Her breasts took up so much space in her shirt that her perfectly flat, firm midriff was exposed.

“L-Liz?” Will was incredulous.

“What do you mean, of course it's me. You were away at school for a whole year, so you missed my um...growth spurt. Mom emailed you about me developing superpowers, right?” Elizabeth stated matter of factly, as it it were the most normal thing in the world to mention.

“You developed what? She didn't say anything like that, really.”

“She didn't even say what I can do now? Jeez, Mom's been so secretive about the whole thing. She doesn't let me do anything fun in public, either.” Liz pouted cutely, and Will saw she was indeed the same little sister he'd always known. Still, he gulped as his gaze was drawn back down by the almost tangible gravitational pull of her massive breasts.

“Jeez, Liz. What size are those now?”

“Gosh big bro, I know they're huge now...but I'm still your little sister, you know. I don't know what size they are anyway, I never wear bras since they're so super firm. I've had to be careful with them, since if I take too big a breath they'll tear apart my shirt and when my nipples get hard...well...you wanna see?”

Will gulped.

“Haha, just kidding. Anyway, why would you want to see my boobs when I can show you all the other cool stuff I can do. Mom is out getting groceries, so we've got some time. Soo