Blaine is not perfect.
Kurt realizes this fairly shortly after he starts living with him at Dalton, because Blaine's side of the room tends to perpetually look like it has been hit by a small tornado. He cannot even imagine the amount of effort Blaine must have put into tidying up when he used to come visit. It's actually pretty cute.
Not that he's thinking of Blaine that way, or anything.
This resolution is helped by the fact that Blaine has no concept of personal space, as it pertains to his roommate. Which, when it comes to hugs, Kurt very much appreciates, but when it comes to leaving cups of cold coffee all over his English paper, the one he spent about six hours on, and doesn't have time to reprint so the cover page doesn't have a huge ring on it, and their shared desk in general, he is not such a fan.
Granted, Blaine goes to Ms. Peterson and informs her that it's entirely his fault, and manages to effortlessly worm both of them out of trouble (or, in Kurt's case, a docked grade) and buys him muffins and mochas/coffee (he's alternating) for two weeks to make up for it. (Normally Kurt wouldn't eat muffins, but they're being delivered to him in bed by a cute boy in pajamas and glasses, with a smile like a sunrise, and he's not made of willpower, for god's sake)
He has to say, though, living with Blaine is pretty great, aside from the occasional space issue (and the more common issue of him finding his roommate shirtless and losing the ability to breathe, but he's working on that). They watch Disney movies, Blaine plays guitar for him and they sing along to oldies with their entire floor, and he discovers that the Blaine he thought he knew when he first came to Dalton is not actually Blaine.
Blaine is a dork, and Kurt adores it.
He's watched every episode of Star Trek (every series - even DS9. That's commitment), can quote most of the Harry Potter books from memory, knows the chords to every Disney song by heart…
And, Kurt discovers at the Warblers Christmas Party, when someone spikes the punch (he suspects Jeff, or, rather, Wes does, but no one will admit anything), when he's drunk, Blaine plays a pretty mean kazoo.
He also gets a little more flirty, which is why they fell asleep holding hands, and when they wake up the next morning, with perfect memories and killer hangovers, cursing Jeff to the deepest depths of hell, whether he did it or not, Blaine turns to him and smiles shyly.
"Hey, Kurt… when I said I wanted to kiss you last night, but I couldn't, because you were spinning too quickly…"
"Yeah…"
"You've stopped spinning."
Kurt kisses him, without a thought for morning breath or his skin.
A few minutes later that all comes back to him.
But the intervening minutes make Kurt appreciate that Blaine isn't perfect, but he's something better.
For now, at least, and possibly one day forever, he's all Kurt's.
… and so is his kazoo, which is being confiscated until after midterms.