Lancelot
Disclaimer: Shockingly i don't own Harry Potter, i'm making no money off of this so please don't sue.
Summary: Ron always knew he was the knight to Harry's king but that doesn't mean he can't get the girl.
He'd had always known he was the knight to Harry's king; it was as obvious as the scar on Harry's forehead and it didn't really bother him, at least not anymore. There was a time; a time that he would much rather forget, when his urge to shine had almost driven them apart, but that was in the past. He needed Harry, that was obvious as well but it had taken that brief separation for him to understand exactly why: it wasn't just friendship, it was duty. He came to realise that knight without his king has no purpose and he needed purpose. He knew the others still thought he was jealous of Harry's fame, and perhaps he was, a little. There were times when his tendency to be pushed aside stung a little, or when someone would say something and he'd remember why it used to affect him so. Still, mostly it was behind him and in fact there was only one thing that really bothered him about his position as the sidekick and that was Hermione. Hermione was definitely the queen of their little trio, and if she was the queen and Harry was the king, where did that leave him, romantically?
It was a thought that plagued him often when he was alone with either one of them, and worse when he saw them together. He watched them for little signals of what he knew must one day appear, but saw, to his relief, nothing. He knew it was selfish of him to wish them apart when an idiot could see how well suited they would be, but he wished it all the same.
It was Harry who asked him about it, "Why do you watch me like that?"
He explained.
Harry looked at him for a moment with a puzzled expression before saying, "you really are a prat you know that."
Harry didn't mention it again, though he did give him looks of exasperation every time he saw he was watching them.
Hermione didn't ask him about it, she skipped that part.
"You're an idiot you know?" she told him one day, not too long after Harry had spoken to him.
"What have I done now?"
She shrugged.
"Then why…"he tried to protest
"Its because of what you haven't done," she said simply, "you've never read any of the king Arthur legends."
"Of course I haven't," he said bemused, "why would I have done?"
"No reason."
She would say nothing else about it, and when he asked chided him about finishing his homework.
When he told Harry about it, he laughed and suggested that he start with the ones about Lancelot and Guinevere. Typical that'd he'd know exactly what she was on about; it just went to show how perfect they were for each other.