A/N: There's only one more to this scene after this, so I'm drawing it out as long as possible :) Warnings for oral sex.
"No!" Kurt begs, grabbing at the blankets beneath him, bunching the fabric between his fingers. "Don't stop! Please God, don't stop!"
With that, any and all pretense of Kurt as an indecisive, shy violet leap headlong out the window.
Sebastian stares at Kurt, stunned into silence, but not for long before his lips curl into a smooth, seductive grin.
"God, huh," Sebastian teases, lingering barely above Kurt's crotch, his warm breath washing over Kurt's cock with every word. "Well, hold the compliments until I'm done, gorgeous."
Kurt groans and drops his head to the pillow, slain by Sebastian's corny remark, but more for Sebastian making him wait. He braces himself, waiting for Sebastian to pull his jeans off, finding himself tense with anticipation, but with no word of warning Sebastian's velvety tongue caresses his length, moving slowly against his overheated skin. Kurt's back arches off the bed, and he growls deep in his throat with the unbridled ecstasy that courses through him. That first touch of Sebastian's tongue erases everything else – all of his anxiety, all of his fear. Every rational thought he's ever had is wiped completely away; his name, his phone number, his address, all gone. Every nerve ending in his body fires at once, overwhelmed with the sensation of hot and wet, a combination so mind-warping and perfect that Kurt can't imagine this being any more incredible.
But Sebastian keeps going. He takes Kurt into his mouth until the head of Kurt's cock brushes against the back of his throat. A tiny worry tugs at Kurt; an errant thought of, 'How is Sebastian going to breathe?' He rises up on his elbows to peek down at Sebastian just as Sebastian's eyes lock on his. His green eyes twinkle deviously. He wraps his lips tight around Kurt and sucks hard.
"Holy fucking shit!" Kurt screams, and he can feel Sebastian chuckling around him, the vibrations tingling like electrical sparks crackling over his skin. Kurt bites his lip and cries out, nearly lifting entirely off the bed before crashing back down to the mattress. Kurt expects him to stop, to ask him if he's okay, to see if what he's doing feels good (though how he can misinterpret Kurt's primal chant of "Oh God! Oh God!" Kurt can't possibly imagine), but Sebastian doesn't stop. He becomes bold, mercilessly holding Kurt's bucking hips still in his strong grasp, emboldened by his breathy pleas.
"Yes, Sebastian! Don't stop, Sebastian! Yes, yes, yes…"
Kurt's body isn't his own. He can't control what's happening, can't control his reaction. He curses unexpectedly when Sebastian swallows around him, and Sebastian curls his nails into Kurt's hips in response. Kurt can't stifle his moans, or the way his hips struggle to move. His restless heels dig into the mattress beneath him. Kurt's mind begins to spiral out of control, but he does know his body; he knows that he's submitting. Too soon, it's about to end too soon, and Kurt's body begs for it. He wants to cum. But he needs that end to be with Sebastian, together, wrapped in each other's arms.
"Sebastian…Sebastian, baby…stop," Kurt moans while his brain rebels, screaming, 'Are you kidding!?'
Kurt is inclined to agree when Sebastian shakes his head and frees one hip to use his hand to fondle Kurt's balls.
"Oh, Sebastian!" Kurt groans, trying to pry himself free. "Baby, you're going to kill me, and…and we're supposed to do this together…don't you want to…God, Sebastian…"
Sebastian can hear his boyfriend's voice become rough and faint as he fights off his orgasm. Sebastian wants to give that to him, wants to feel him pulsing in his mouth as he cums down his throat. He's dreamt for so long about having Kurt this way – writhing and desperate and at his mercy.
But that's not the 'first time' he promised Kurt.
Pulling away from Kurt's cock, throbbing against his tongue, is the hardest thing Sebastian's ever done. Even with all of his protesting, Kurt whimpers when Sebastian stops.
"Later," Sebastian pants, crawling back up Kurt's body to kiss his boyfriend, hard and filthy on the mouth, "you have to let me finish that later."
Kurt nods against the assault of his mouth, grinning and giggling, folding his arms around Sebastian to hold him, his entire body vibrating and euphoric.
"Whatever you say," Kurt mumbles. "But for right now…"
"I know, I know…" Sebastian is preoccupied peeling Kurt's tight jeans down his thighs, abandoning Kurt's mouth to finish the job, but as soon as he does, he stops and stares. Yes, they've done a lot, mostly clothed and in the dark, but until now, Sebastian hasn't seen his boyfriend completely naked. Kurt's scar runs down the length of his body, over his hip and devastating his right leg (thankfully the fire managed to avoid his genitals. How Kurt managed to dodge that bullet, he'll never know. Maybe the great spaghetti monster in the sky has a soft spot for bereft, OCD children).
Here is Sebastian's last chance to balk, and from the blank expression on his face Kurt can't tell if he's actually going to take it. Sebastian has always been able to surprise him, and this time is no exception.
"Holy shit, Kurt!" Sebastian's voice shudders as he reaches for his fly, fumbling to strip off his own pants. "Tell me how the fuck I got so damn lucky."
Kurt opens his mouth to retort, trying to find a witty come-back, but Sebastian has left him speechless. He blushes, turning slightly to face away from Sebastian and his too-good-to-be-true compliments. Sebastian sees Kurt move away and pounces on him, moving Kurt's body towards him, hands holding Kurt's body against his.
"Don't turn away from me, gorgeous," Sebastian whispers, his breath hot against Kurt's cheek. "Don't deprive me of this."
"You're ridiculous!" Kurt giggles. Sebastian smiles bright, locking a leg around Kurt's and keeping him close.
"Maybe I am," he agrees. "But I'm the ridiculous man who's hopelessly in love with you, Kurt Hummel, so you're going to have to live with it."
That admission almost breaks him. Sebastian has told Kurt a hundred times or more that he loves him, but 'hopelessly in love' seems like something different, something more important entirely.
"Really?" Kurt murmurs. "Hopelessly?"
"Completely and hopelessly," Sebastian replies with the brightest smile Kurt has ever seen. "I swear I wouldn't say it if I didn't mean it."
"Good…" Kurt stutters, liquefying beneath Sebastian's disarming smile. "Because I was beginning to think I was the only one."
Sebastian's hand finds its way to the nape of Kurt's neck, thumb rubbing along the line of Kurt's neck.
"I love you." Sebastian's lips travel in soft kisses over Kurt's jawline. "I love you, I love you…"
Kurt leans in to Sebastian's kisses, absorbing his professions of love into his skin and notices for the first time, as his body is twined with Sebastian's, just how well they fit together. In this room, away from anyone who would see them and judge them, who might comment about Kurt's horrific scar or wonder out loud why Sebastian would ever date him, they're just two people in love.
That's all they ever need to be.
"Kurt?" Sebastian cards careful fingers through Kurt's hair, scraping his nails over Kurt's scalp in a tender call for his attention. "Baby? Have you given any thought to…"
Kurt's brow furrows as he meets Sebastian's eyes, but Sebastian ducks his head bashfully.
"Uh…wow, they never tell you about this part, do they?" Sebastian chuckles.
"What part?" Kurt breathes, completely lost.
"The awkward conversations." Sebastian clears his throat, cheeks pinking adorably. He meets Kurt's eyes again, refusing to feel ashamed. "Have you given any thought to whether or not you want to be on top or bottom?"
Sebastian bites his tongue, thankful he managed to say that all in one, fairly steady breath.
"Wh-…oh…" Kurt's eyes dart away as he considers. He never realized all the technical considerations of having sex for the first time. Sebastian's nervous laugh against his chin tells Kurt that he may have just absent-mindedly voiced that admission. Kurt conjures up the daydream of his first time that he's carried with him since high school - the cheesy romantic atmosphere, the music, the candles, the bed littered with rose petals - so different from reality with one constant factor the same; a man he adores making love to him.
"Bottom," Kurt says quietly, "I-if you don't mind, of course."
Sebastian's smile tells Kurt that he certainly does not mind.
"I…no, that's great, actually." Sebastian kisses Kurt one last time before rolling away to the table by his bed side, rummaging through the drawers for the things he needs. When Sebastian returns to Kurt, Kurt meets his sheepish smile with a raised eyebrow.
"Just out of curiosity," Kurt asks, "how long have you been planning for this?"
"Honestly?" Sebastian asks.
Kurt nods once.
"After that day I took you to the coffee shop."
Kurt pulls a face that makes Sebastian laugh furiously.
"B-but…but I left you there!" Kurt sputters. "You trusted me, and I ditched you!"
"Yeah, I know," Sebastian looks down at his hands, at the condom in his palm, and smiles thinking how far removed they were now from that day. "But I wasn't ready to give up."
Kurt's eyes follow Sebastian's gaze, looking down their bodies at the two of them tangled together, and smiles in return.
"I'm glad you didn't give up," Kurt admits, talking softly against Sebastian's skin.
Sebastian sighs, kissing Kurt sweetly along his hairline.
"Me, too."