At home, in the sanctum of his music room, Blaine waits. Beneath his fingertips, the soft press of the piano keys settles his concentration within Chopins Trois Nouvelles Études. The progression of the music moves through him, as delicate and intricate as lacework. It holds him within a singular slipping moment, and he finds perfection in his practice.

When the knock on the door frame finally comes, Blaine smiles through his next breath and eases the piano into silence. Kurts bright voice follows, "I found a song for Mr. Schues assignment. We both love it and its ideal for a proposal."

Blaine turns and sees Kurt, slipping off his shoes and then setting his bag in the brocade armchair by the door. The winter sun shines coppery highlights in Kurts hair and sharpens his features. He whips a sheaf of paper from his satchel and presents it with a flourish. "Okay," Kurt says. His cheeks are pink from the winter wind. "Ive fiddled with the arrangement, divided the lyrics as I imagine will suit Mr. Schue and Miss Pillsbury. I dont know if we should assume shell sing with him or what, but its a place to start." Kurt takes a quick breath. "You can have his part, and Ill take hers."

"Sounds great," Blaine says, curious as Kurt passes him the music. He reads the title and smiles. "I already know this one," he says. He played it obsessively after the film came out, but he didnt have anyone to accompany him. "Youre brilliant."

"I know." Kurt preens beneath the praise and then steps lightly, with one well-placed sock-clad foot, onto the bench next to Blaine, then over to the edge of the keyboard, turning nimbly to hoist himself up to sit atop the piano.

Blaine arranges the pages on the stand, glances over the music to note Kurts changes, and he starts playing. His voice hasnt warmed up, so he begins softly, directing the lyrics up at Kurt: "Never knew I could feel like this."

Kurt bites into his bottom lip, and his smile widens. It crinkles the corners of his eyes, shines in his gaze, and catches the next beat of Blaines heart. Sunlight makes a halo in the fuzzy texture of Kurts turquoise sweater, which in turn brightens his eyes. Effortlessly, Blaine channels the sentiment of the song, sincere in his yearning for the steadfast love he finds in Kurts gaze. "But I love you, until the end of time."

The clarity and weightless grace of Kurts voice joins his on the next phrase, rising on the simple harmony, "Suddenly the world seems such a perfect place."

Its nearly enough to stop Blaines singing, so he may listen to Kurts voice alone. But they sound so good together, rich with texture and feeling. The music pulls at him, carries his voice into richer resonance, steady and sure, entwined with Kurts. And, as they sing, it expands around them and swells in Blaines chest, drawing him toward—

Blaines hands still. "Wait," he says and looks down at the keyboard. "Stop, please." Kurts voice tapers into silence.

Blaine flattens his fingers against the keys, and he doesnt look up. Quietly he speaks, "I dont want to sing this song for Mr. Schuester or Miss Pillsbury. I dont want to sing it for a Glee Club assignment at all."

It hangs between them for a heartbeat. Then Kurt responds, "But we like this song. We sang along together when we watched Moulin Rouge last month. We both cried, Blaine. Its perfect for the assignment."

"It is perfect." Blaine turns a nervous glance up to Kurt, sees the crease between his eyebrows. "Thats why I cant do it, Kurt. Its perfect for us. Maybe Im being selfish, but I dont want to share this with Mr. Schue. I want to keep it just for you and me."

Kurt blinks and his frown relaxes. "Like it would be our song?" Kurt asks, smiles fondly. "You know Ive always thought of Teenage Dream as our song."

With a shrug, Blaine ventures, reaching a hand up to Kurt, "We wont be teenagers forever."

Kurt reaches back, and Blaine can feel it in the hold of Kurt's hand and see it in his wide-opening gaze, the implication settling into understanding.

"Its going to be us, one day, isnt it?" Blaine says.

"Youre talking about us— Oh." Kurt swallows, and his voice wavers when he continues. "Getting married?"

"Dont you think it would be amazing to sing it together and know we mean it?"

"I mean it now, Blaine.”

Blaine runs his thumb along the bare line of Kurts ring finger. This intimacy is still such a new thing between them, and hes still learning the patterns of its intricacies. But this he knows. "Thats why."

"So," Kurt begins cautiously. "Are you saying you want us to, one day, sing this to each other at our wedding?"

Blaine presses his lips together to restrain his smile. He doesnt quite trust his voice. Instead he nods. He loosens his hold on Kurt's hand.

But then Kurt tightens his fingers around Blaines, reassuring, and he flashes Blaine a quick grin. He speaks with humor coloring his tone and a demure twist of his shoulders. "Youre not actually proposing to me now, are you?"

With a sudden laugh, Blaine glances down for an instant. "No, Im not." He tests the weight of the next words in his mind before he speaks them, "But I want to. One day."

"You...?" Kurts voice gives way and shyness softens his expression. Theres no trace of teasing when he says, "I expect you already know my answer."

"Maybe," Blaine says, though his heart pulses with yes. "But Ill wait until I ask you to hear it."