Derek's dreaming. That's the only explanation, because even if it's after hours and Derek's office door is locked, there is absolutely no way that Spencer Reid is really kneeling on his desk and doing what can only be classified as a strip tease. His breath catches in his throat when Spencer hooks his finger under his tie and works it down, his hips swaying to the off tune melody he's humming under his breath. It takes a minute for Derek to place it as 'Afternoon Delight,' and he bursts out laughing when he finally does. Spencer, whose tie slips between his fingertips to pool on the desk while he pops open the buttons on his shirt, grins at Derek, and the fact that he gets exactly why this all seems so absurd makes Derek love him that much more.
It takes almost no time for Spencer to unbutton his shirt, and then he's shimmying out of it in a way that makes Derek shift in his seat even as he chuckles. The shirt is still tucked into his pants, and it hangs around his slim hips after it falls from his shoulders. Derek's fingers curl around his armrests so that he won't reach out and tug it off completely, because Spencer's playing a game, and somehow he doesn't think that fits into it. The approval in Spencer's eyes confirms his suspicions.
Spencer rakes his fingers through his hair and arches his back, an indecent moan slipping from between his lips at the stretch of muscles that have been still and confined to a chair for too long. There's still a glimmer of amusement in his expression, but when he licks his lips and drops forward onto his hands to slowly crawl across Derek's desk, the temperature suddenly shoots up by about ten degrees. The file Derek had been reviewing when Spencer walked in just a few minutes ago slips off the edge of the desk, papers scattering everywhere, but neither of them move to fix it. Instead, Spencer shifts so that his legs are hanging off the desk, and he hooks a foot around Derek's armrest and pulls it closer until he can slide directly onto Derek's lap.
There's a moment where Spencer wobbles and it looks like the chair might overturn, sending them both to the ground, but Spencer clutches the back of the chair with both hands and Derek plants his feet firmly on the floor and grabs Spencer around the waist until they stabilize. Spencer looks down at him, his pretty doe eyes huge, and the corner of his mouth twitches just enough to make Derek's shoulders shake with suppressed laughter, and it's suddenly all they can do to keep from cracking up. When he thinks he's back under control, Derek presses a kiss to Spencer's collarbone and nearly loses it again when Spencer flutters his eyelashes at him. Any mood there might have been is gone, completely broken, but it doesn't matter, just like it no longer seems to matter that they spent the last five hours on the jet or that they got home just that much too late to make the plane for the weekend trip they'd been planning. Because right now, after the week they've had, he can't imagine a better birthday present than just laughing like this with his lover.
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