Most people didn't know this, but there was a small props closet under the stage at McKinley. It was where Mr. Schuster stored costume racks with outfits from Sectionals' gone by, and two bookshelves full of random props saved from school plays. Blaine remembered, after the last performance of West Side Story, he had to go down there with a box of fake knives when everyone was striking the show. It had been three (!) days since he and Kurt had had sex for the first time, and his mind kept crawling back into replaying that night whenever he had a moment free. He remembered thinking this was a great private makeout space, like he was keeping some kind of journal now to keep track of these things now. Dusting out some cobwebs he indulged a little fantasy about how he would pull Kurt down there some day after Glee practice when no one would suspect, what things they'd be bold enough to do on school property, how they would scratch their initials into one of those bookshelves after to commemorate the occasion… And then Artie was yelling for him to come back up and help load the set out.
In reality, while Kurt and Blaine had some intense intimate moments in each of their bedrooms and both of their cars, they never really got to fool around in that prop closet, under the bleachers, or any of the other places McKinley teenagers found their way to for such activity. Some of it was because Kurt was really private about that stuff, and some of it was that for all the progress the school made, it never really felt like a safe space to be openly romantic outside of the choir room. And then there was the fact that Blaine was such a goody-goody that any real impulse to get quickie in a dark area of the school was immediately forestalled by anxiety about how that would look on one's permanent record.
But we're back together, it's been forever, and we're doing this damn it. Blaine had been hoping against hope that they were really going to get back together, but when it was really official it was all he could do to keep his hands appropriate until he'd dragged Kurt out of sight and into that theatrical closet.
Kurt seemed eager, if a little shocked. "Hmmm you've gotten bolder in your old age…" he murmured, mouthing at Blaine's neck as he did so.
"Heh, this one's been on my bucket list for AGES, ah, mmm—" Blaine could hardly be expected to think straight with Kurt getting all handsy now.
"I've missed this, ugh…" Kurt breathed, feeling Blaine pulling him closer so they were outright rutting now.
"I miss how you feel against me." Blaine whispered. "I can't tell you—ahhh, yess. There- can't tell you how often I've had dreams about this…
Kurt grinned, kissing him. "I love your dreams. I want to hear. Every. Explicit. Detail."
"Since when are we this dirty?" Blaine chuckled.
"Since some cute guy at the Lima Bean went and said I was dirty cute. And I. haven't. gotten it out. Of my head or my pants since." Kurt now seemed to be trying to devour Blaine alive with kissing him so hard.
It was in the middle of this re-acquainting with each other that Kurt thought of it. It was difficult to focus on much, but in the back of his head, he remembered Rachel. He wondered what Rachel would think of her straight-laced best friend doing this. She would demand all the details, he was sure. And right now he thought he'd be foolish enough to consider sharing them. He hadn't felt so free in a long time. Blaine's energy was electric but his touch familiar. I could do this all day. Now that they were back together, Blaine needed to graduate, stat, so they could have sex in every inch of the loft in New York. Rachel would have to be on some kind of schedule, or they could have a signal to come back later, he mused as Blaine started working at the buttons on his increasingly tight pants. Rachel would understand. And if she doesn't, I'll just have to paddle her backside until she listens to reason… He smiled to himself, feeling Blaine work him out of his pants, the sensation vibrating into his extremeties. In the back of his head, he remembered that he used to spank Blaine too, and maybe that was on again? And we should really talk about that, and Woah. How am I going to explain Rachel?