Based on Season 1, Episode 18 "Something wicked"
Prompt: "You said you're a big brother?" - Michael
"Yeah" - Dean
"You'd take care of your little brother? You'd do anything for him?" - Michael
"Yeah, I would" - Dean
It should have built him up to hear those words – should have meant the world to Sam to know just how Dean felt about him. But instead it ached – no; it clawed at his insides like something terrible trying to escape. And without meaning to Sam found himself questioning everything Dean had ever done.
More than just sacrificing dinners and flying in front of bullets – Dean was sleeping with him. Had been for months now. All Sam had done was ask him, one drunken night, to get him off and Dean had obliged. The question was why – because Dean wanted to, or because he would do anything for his little brother?
Anything he asked.
It was several days before Sam breached the subject. They were on the road again, travelling from one dead end town to the next, when Sam – driving for once – pulled them into a lay-by.
"What's up dude?" Dean asked, questioningly.
"Do you love me?"
"Sam what the hell?! Are you turning into a chick on me?"
"It's just a question Dean."
"Not it's not – it's you saying you don't know. Man, do I have to spell it out? Didn't you hear me the other day? I practically spilled my guts out about what you mean to me."
Sam couldn't help but smile at the way Dean wriggled in the seat, avoiding his eyes.
"Dean you said you'd do anything for me"
"Exactly. Now can we drive on already before my balls drop off from all this mushy stuff."
"Dean are you only sleeping with me because I asked you to?"
Dean turned in his seat and looked straight at his little brother; watched as Sam worried his lip and the sweat settled on his brow. But still Dean didn't say anything.
"Dean please – I've gotta know"
Raising his left arm across the seat, Dean thwacked Sam upside the head. "You're a complete idiot, you know that."
"Ow!"
"Yeah, I only slept with you after you'd asked me, but that was because I couldn't have done it unless you wanted to. Sam, I've loved you for years – but doing anything for you did not involve rape. I was waiting I guess."
"You can be so romantic sometimes." Sam said sarcastically, still rubbing his head.
Dean laughed and climbed into his brother's lap, kissing him deeply. Then in one swift move he shoved Sam back over the other side of the car so he could now drive.
"Jerk" Sam said, teasingly.
"Oh bite me"
And Sam complied.