The day she had a conference

Lana let out a deep sigh. She'd almost forgotten that she had a group meeting today, talking about sales, or something. It wasn't really anything involving her, but it was the sort of thing she had to attend and (at least pretend to) pay attention to. She worked dutifully for a few hours until it was time, then made her way to the conference room.

Lana walked in just as the others were sitting down, leaving little choice for where she could sit. The conference room was floor-to-ceiling windows on two sides, and Lana wound up having to sit with her back to one of them. Better than having the Sun glare in her face, she supposed, but in her black suit, it was uncomfortably warm.

Lana's attention was on the conference, and it isn't like she could look at her back anyway. All she could feel was the heat of the Sun on her shoulders and, through the gap at the base of her chair, onto her backside, as the Sun's light slowly leeched away at the visibility of her clothing. Gray faded to white, white disappeared to reveal bare shoulders above, and pale cheeks below, blue straps and a peek of blue panties the only things surviving, and even they began to fade.

Eventually, the conference came to an end, and Lana got up, stretching her stiff limbs, oblivious to the view she was leaving behind her...