1950s

Natasha cautiously headed towards the voices she could hear. Over a small hill, and she could see a series of squat khaki-coloured buildings, surrounded by a chain link fence, and in the middle several dozen soldiers jogging in unison. Natasha remembered that the site of Avengers compound was previously an army camp, so it seemed like she had only travelled in time, not space.

Behind her was only clear green fields, so Natasha set off down a line of trees, dashing from cover to cover as she made her way closer to the base. Fortunately no one was looking too closely in her direction, as even for a super-spy it was hard to camouflage bright red hair and a voluptuous pale pink body against a tree.

After a while, Natasha reached the last tree, a few metres from the fence. Now she was a bit stuck; she had an idea that she was going to get into the base and find some clothes, but it wasn't as if she could walk up to the sentries on the gate and tell them, "hi, I'm a time traveler from the future, I'm naked because it turns out you can't bring organic matter through time, could I borrow a uniform and maybe a time machine if you have one around?"

But as Natasha watched the two MPs standing next to the gate, an opportunity presented itself. A pretty blonde soldier, dressed in a British rather than American uniform and with her hair done up in ringlets that helped Natasha with dating when she was, came striding towards the gate from the inside. Natasha noticed a patch on the girl's uniform identifying her as part of the Strategic Scientific Reserve.

"Hello, boys." she smiled at the guards.

"Captain Lorraine." one of them acknowledged her, "Going out?"

"Running into the city." Lorraine nodded. She looked up the road, where a jeep was approaching, "Here's my ride."

"See you soon, Ma'am."

The jeep stopped and Captain Lorraine stepped up onto the running board. There was a barely audible "twang" and Lorraine's face filled with shock. A second later, it was clear why. A pale pink silk garment, trimmed with white lace, dropped into view from under her skirt, coming to rest around her ankles.

"Oh, my!" Lorraine looked down in horror at her fallen panties. She stepped back down and turned, which somehow twisted the panties around her ankles, meaning that it became suddenly difficult for her to pull them back up.

As both sentries and the jeep driver hurried to help Lorraine, Natasha dashed the final distance to the base, where she saw a small hole in the fence. She flattened herself to the ground and squeezed through.

She rose up on the other side, plump breasts first allowing her to breathe easier, then she worked on wiggling her hips through. She thought she had made it when suddenly a sharp bit of wire jabbed her in her shapely behind, and she only just managed to subdue a squeal. Then she was through, standing up on the other side and darting to a narrow gap in between two buildings for cover.

"All right," she whispered to herself, "Now what?"

She went silent as she heard someone passing nearby, a woman's voice, British accent, familiar to Natasha from SHIELD archive tapes.

"...swear she does it deliberately, rigs her knicker elastic to snap, she likes the attention. She's a good soldier on duty but when she's off..." the woman came to a stop right by Natasha's hiding place. Shrinking back further into the shadows between the buildings, Natasha saw exactly who she expected to- Peggy Carter, also dressed in a khaki uniform with an SSR patch. She was talking to a petite dark-haired woman with thick glasses, in civilian clothes, who was carrying a clipboard. "Anyway, where was I?"

"The Zola Tube." the woman replied.

"Yes, let's wrap up the testing today, find out once and for all if it's actually going to work. They want him back at Camp Lehigh tonight, some big project they're working on. Go to final phase, figure out if that thing actually can create time travel, and then book his jeep."

"Yes, Ma'am."

"And order Captain Lorraine some new underwear, extra-strong elastic..."

Peggy walked off, but Natasha knew now what she had to do.