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"Sheldon."
"Yes, Leonard?"
"Has it occurred to you," Leonard pushed his glasses up on his nose and peered through them, "that you and Penny have gotten rather, close, lately?"
Sheldon paused for a millisecond, then continued scribbling on his white board. "In which way?" He squinted, turned his head slightly, then leaped forward with a final equation which a noise of triumph.
"You do everything together." Leonard sat down on the corner of the desk stirring his cup of soup halfheartedly.
"Not true. Penny goes jogging every morning, and I would never jog."
"Comic con, movies, private dinners..." Leonard ticked off.
"You were also at Comic Con, Penny won two tickets to every new release this summer, and dinner in a restaurant could never be, as you say, private."
"Sheldon, you're dancing around the issue."
"I don't dance." Sheldon murmured, taking a picture of the finished equation and then sitting down to load it into the computer and numerous types of data storage devices. He did dance, of course, when it suited him but the occasion was so rare that it didn't bear mentioning. Last weekend for instance, when Penny had been watching Strictly Come Dancing, ("Dancing with the Stars, only with British accents!" She'd raved) and she'd sighed that she wished she knew how to waltz, he'd explained that it wasn't really that hard as long as you kept the count, and pulled her up for a little demonstration before continuing on to the kitchen to see if there was any pecan pie left.
"Sheldon, what are you thinking of?"
"Pecan pie, why?" Sheldon glanced up at his co-worker in confusion.
"You were smiling."
Sheldon shrugged. "I like pecan pie."
"Who made the pie?" Leonard persisted.
"Penny."
"You never invited us over for pecan pie."
"Of course not. Then I'd have to share it. I already said, I like pecan pie. Honestly Leonard, this is why you are only a experimental physicist."
"I'm a experimental physicist because that is what I chose to be, not because I.." Leonard paused. "Oh well done. You have been learning from Penny."
"She has a depth of knowledge about social interaction that is staggering, and I would be remiss as to not take advantage of the chance to expand my abilities in an area which is not offered as a university course." Sheldon agreed. "Now, I ask that you leave."
Leonard frowned. "Why?"
"Because I have just solved that problem I have been working on for months, and I have to type up my notes and report, so that I can go celebrate with Penny."