A/N: This is a teacher!Sebastian and student!Kurt 'verse I started a few days ago. We'll see where it goes! :)

Warning: Infidelity

*Note: Warning is applicable to entire story.

Sebastian didn't have to look up to know who entered his classroom just ten minutes after the lunch bell rang. A click of the lock confirmed his suspicions.

"What are you doing, Kurt? You know we were two minutes away from getting caught last week with the door locked."

Kurt ignored him, sauntering over to his teacher's desk and wasting no time in dropping his bag and tilting Sebastian's chin up for a kiss, straddling him gently without missing a beat. Sebastian could feel the tension as he reached to place his hands lightly on Kurt's shoulders, but he ignored it. Pushing for explanations never went well with Kurt, as he was quick to learn.

"I just want to see you," Kurt whined. "Somebody had a busy weekend and couldn't spare even two measly hours."

Sebastian sighed, only slightly exasperated, moving to rub smooth circles over Kurt's thighs and avoiding his gaze. Kurt ran his fingers through his teacher's hair, pulling gently at the tips to tilt Sebastian's head back. He ducked his head forward, fingers grazing over Sebastian's collarbone before pulling his button-up down slightly so Kurt could suck lazy kisses into his skin where it wasn't visible, still quick to move from spot to spot, ensuring they'd be gone by the end of the school day. Sebastian sighed again, contentedly this time.

Sebastian reached to place his hand behind Kurt's neck to pull him back slightly, ignoring the noise of protest (and carefully avoiding Kurt's hair—he'd learned his lesson the hard way with that one). He pulled Kurt forward to meet his mouth again, annoyed as usual with how gentle he had to be at school. They couldn't allow themselves to get too heavily into it, since swollen lips, flushed cheeks, and tighter-than-usual pants would be a dead giveaway. It didn't matter, though, as Sebastian moved lazily with Kurt, their lips just brushing, licking into each other's mouth gently and just breathing together, taking each other in. Kurt was the first one to pull back, which was certainly not the norm. Sebastian looked at him questioningly.

"I should cool down," Kurt explained, swiveling his hips slightly so Sebastian could feel his erection through his pants before gracefully lifting himself off Sebastian's lap, perching on the edge of his desk.

"Yeah. Probably a good idea," Sebastian agreed, adjusting himself. "I don't want to spend the first fifteen minutes of my next class having to sit down again." Kurt just gave him a small smile, standing to pace around the room a little, tension clearly straining his shoulders once more.

Sebastian waited.

"So, how did the appointment go?" Kurt asked, sure to avoid Sebastian's gaze.

Sebastian swallowed the lump in his throat, clearing it before responding, "Pretty well. They're, uh, pretty sure they're going to induce her. Two weeks from Wednesday. Unless it comes before then, at least."

Kurt nodded in acknowledgement. "So at least we have an exact deadline. That's good."

Sebastian sat, his fingers twisting his wedding ring anxiously. His fingers immediately went still when Kurt looked back over to him. They stared at each other for a minute before Kurt walked slowly back to the teacher's desk, picking his bag up from the floor.

Sebastian stood, only slightly taller, looking down on Kurt who was staring determinedly at his neck. Sebastian nudged Kurt's head up to meet his eyes, asking silent permission. He saw what he was looking for and slowly dipped his head down, brushing his lips against Kurt's with the lightest touch.

"I love you," Sebastian reminded him softly, his deepest secret exposed in the room where it all began, the one thing that would ruin his marriage, his career, if ever revealed.

"I know," Kurt responded. "Me, too."

Kurt hitched his bag higher up on his shoulder before turning to walk towards the door of the classroom. A little over two weeks. That was all they had. He'd known for months, of course, ever since they had officially decided that the birth of Sebastian's baby would bring an end to their affair, but it didn't make it any easier. Not for either of them, Kurt knew. He could hear Sebastian sigh behind him, plopping into his chair. Kurt could imagine how Sebastian's elbows would rest on his knees, allowing his head to drop into his hands. He wanted nothing more than to turn back around, keep the door locked, and kiss away every stress line that was likely marring Sebastian's face, but he knew he couldn't.

Kurt sucked in a deep breath, holding it as he unlocked the door, stepping outside, and rejoining the world where everything was as simple as weekend sleepovers and glee club rehearsals, where he was a student, and Sebastian was his happily married teacher with a baby on the way. In just over two weeks, that was all they'd be.