Credit to heavenisalibrary
The Doctor should have known from the very start that allowing River to take he and Clara to a night club was a terrible idea. He'd refused from the outset, but after she'd explained that it was the grand opening of a night club with a glass floor that hovered over some twenty feet over rock crystal formations that soared miles high during a full moon — which, in combination with some preparation from the night club, would cause the crystals to glow a whole spectrum of colors — he'd finally relented, because River was right as usual, it would be stunning to see, but somehow in that conversation he'd been taken in because River had begun talking on and on about the rock formations and gotten his scientific interests piqued. She'd totally stopped using the words night and club at all (which he now realized was intentional) and so it wasn't until he opened the TARDIS doors and saw the lights and heard the pounding music and laid eyes on all those sweaty, gyrating bodies that he realized what he'd gotten himself into.
He gulped.
The Doctor was hardly ever at ease in his own skin — perhaps because it didn't always feel like his, because it changed so much, because this regeneration's limbs were bandy and ill-suited to coordinate with one another — but he could think of few situations that would be as physically or mentally taxing as trying to act natural in a nightclub. He straightened his bowtie and pulled at the edges of his suit jacket, glad he'd dressed up from his tweed, but somewhat pining for the leather of his ninth incarnation.
"Calm down, sweetie," River said from behind him as she and Clara re-entered the console room. She rested one hand on his shoulder as she slid into the doorway next to him, pressing her body to his side. She straightened his bowtie a bit and smoothed a hand down his chest. He relaxed a bit, but his shoulders remained somewhere around his ears. "It's just a night club."
"River, I don't think —"
"C'mon, chin boy, pull yourself together," Clara said, coming to stand on his other side and giving his shoulder a gentle punch. "It's going to be great — just lie back and think of the rock formations."
Clara and River laughed greatly at that, and River kissed his cheek before taking Clara's arm and disappearing into the dark of the club. The Doctor lingered for a few moments before sighing and relenting, closing the doors of the TARDIS behind him as he grudgingly shuffled into the club. The hallway they'd landed in was dark and dull, with the main room visible in the immediate distance; bright lights and dancing people, and oh, he could practically seethe libido coming off of the dancing — if one could call it that — people in waves, and it made him a whole other kind of nervous. Still, he pressed onward.
The main room was large and expectedly dark, with some flashing lights and neon lights and black lights and strobe lights sporadically brightening the room. When he looked down, however, he could barely withhold a squeal of glee. Despite her slightly underhanded tactics, River hadn'tbeen lying. The floor was totally transparent, and spires of gleaming crystal rose from the valley underfoot, jagged edges and complicated turrets of glittering rock catching the silvery moonlight and casting beams of pale light up through the floor and reflecting off of one another, rainbows catching in the glass. There were a handful of lights beneath the club, the Doctor realized as he looked on, different colors lights that brought out the different hues, and the effect was stunning.
The Doctor strolled around the perimeter of the room for a few moments, just admiring the natural architecture below, until he accidentally bumped into someone — who turned out to be River. As he looked up from his position, crouched a bit toward the floor, he took notice of her outfit for the first time — sky-high heels and bare legs, and as he stood, progressed to a short black dress that clung to her absolutely distracting curves, leading to a neckline that he wasn't sure would hold her in should she start to dance, and then up to her red, red lips and gorgeous eyes and wild hair. He gulped again, this time for an entirely separate reason.