I do not own Supernatural or its characters. Warnings for bullying/ableism in this!

Sam loved his brother till the end of the Earth, and would go to hell and back for him. After all they've been through, it was hard not to love his sweet, fragile, and over-protective older brother.

Their dad wasn't around much, usually away on business or with Bobby, their in-a-way uncle. Sometimes John would be gone for days, but with Bobby checking in on them frequently and Sam's forced maturity, both younger Winchesters were fine.

School here was a bit rough, everyone in town knew about Dean, and deemed Sam as 'the retard's brother'. Usually people left Sam alone...but there was always that one occasional bully that would torture Sam for a few weeks before moving on. But Sam focused on school, constantly being at the top of his class and studying for hours if he could. He wanted to become a lawyer, and then with his money he could buy a house for him and Dean to live in.

And everything would be perfect.

Tonight so far consisted, of an absent father and a pile of homework. As much as Sam liked being in high school, he didn't particularly like the boatloads of work that came with it. But the sooner he got it done, the more time he could spend with Dean, who was dividing his attention between staring hopefully at Sam across the kitchen table, begging for attention, or unconsciously playing with his toy cars.

"Sammy, look! Baby is winning the race," Dean exclaimed, driving the smaller replica of John's '67 Impala to the invisible finish line, beating the unmoving toy fire truck a few inches away. Dean loved their dad's car, calling it 'Baby' respectively and sometimes he would watch John do repairs on it. Dean couldn't do it himself of course...but maybe someday he could.

Prying his eyes off his math homework, Sam smiled at Dean, giving him the attention and approval Dean wanted and needed, "Awesome." Dean giggled, green eyes sparkling with love and innocence. Sam felt his heart tug a bit, but looked away and tried to direct his attention back to the calculus he was working on, before Dean spoke again.

"Can I help, Sammy? It looks really hard."

Sam smiled and shook his head, "No. It's alright, Dean. Just go back to your cars. Try and see who's going to win this time."

Dean nodded, and went back to his race, making the appropriate noises of screeching tires and the roar of an engine. Sam was going to remind Dean of using his inside voice, but decided not to, since his older brother looked so happy off in his own little world.

In the past five years since the car accident that killed their mom and left Dean like this, Sam grew to know more about him then John, Bobby, and Dean himself combined. When Sam first realized that Dean would forever be a child in a man's body, he quickly accepted the caretaker/brother role.

At first he was furious, knowing that his brother would never be able to have the life he deserved. But Sam had calmed down, knowing that being angry at the world would get him nowhere. It never did.

The damage inflicted on Dean rendered him mental capacity of a six-year-old, or at least that's what Sam remembered the doctor tell him and John that night after the accident. His whole personality was childish: too trusting, and too friendly.

That wouldn't bother Sam as much if he didn't know how many people out there would take advantage of Dean's condition and hurt him. So Sam had made Dean promise to never talk to strangers and always be careful. Always.

But that didn't mean much, since Dean never really went anywhere except the grocery store, the backyard behind their house, or Bobby's house and scrap yard. And even then Sam was with him, since Dean tended to get lost quite a bit or would stumble over something on his uncoordinated legs.

That was another thing, the head injury affected Dean's fine motor skills. Walking was a challenge often, Dean's legs were shaky and wobbled a lot. After many falls and scraped knees, he learned to stop running, unless he was excited about something or absolutely had to. He would never want to bother Sam when he toppled over, saying 'It okay, Sammy. I getting up.'

Sam likes to think a small part of Dean is unaffected by it all. Even though that may not be possible.

I don't really know on whether or not to just keep this as a one-shot or whatever. Or maybe make it a multi-chapter fic. Or just a series of oneshots surrounding this AU. Tell me what you'd guys like in the comment/review section please! Thank you! :)