It started with angles.

Beautifully proportioned angles, to be sure, but located in an area that Sheldon had paid no attention to before. Penny had risen from the couch after a Lord of the Rings marathon, raised her arms high above her head, and stretched. Her back arched, her tank top inched itself up and over her hips, her navel, to rest just below the swell of her breasts.

The gentle curve of her spine, the sinuous lines of her narrow waist as it dipped and flared out to her hips. It was…fascinating.

Why had he just now noticed the beautifully proportional geometry of Penny? Was it circumstance? That finicky bastard called Chance? Or was it the way the warm light of late afternoon had settled on her skin, the play of light and shadow that highlighted those curves by which Sheldon seemed to be quite stricken. For a moment, he imagined running his hands over those concave and obtuse angles, tracing the line of her back with his finger, working the math of her body with his palms.

Sheldon averted his gaze as Penny dropped her arms and flopped back onto the couch. The patch of skin disappeared back under her tank top. She tucked her legs beneath her and asked them all what they wanted for dinner tonight - it was Thai night, and she had a craving for some spring rolls.

With a strange rush of relief, Sheldon took it upon himself to point out that the Spring Roll Appetizer came with only four rolls, and for every person to have a roll, they would have to order two appetizers, which would only exacerbate the problem as that would leave three extra rolls to distribute amongst five people.

Penny rolled her eyes and picked up the phone, sending him a pointed look when she ordered the Pad Thai, Drunken Noodles, Hot Red Chicken Curry, and the Spring Roll Appetizer with one extra roll.

"Simple," she said as she clicked off the phone and tossed it to him.

No. Not simple, Sheldon thought. He couldn't see those equations jumbled beneath her clothes anymore, but he knew they were there. He was curious.

And as anyone who knew him could tell her, a curious Sheldon is very dangerous indeed.