When the turbulence had first started - less than an hour into the five hour flight - Liz had felt fine. Two hours later, she felt decidedly less fine under the continuous glow of the fasten seat belt sign - partly because the turbulence hadn't let up, and partly because she hadn't had time to pee since her connecting flight early that morning.
She had already turned down two offers from the flight attendant for drinks. The last thing she needed right now was more liquid in her bladder. She didn't quite understand how the flight could be smooth enough for the flight attendants to walk around serving drinks, but not smooth enough for the captain to turn off the fasten seat belt sign and allow her to visit the restroom; however, the flight attendant hadn't been willing to negotiate the point. Liz would not be allowed to leave her seat until the captain turned off the fasten seat belt sign. No exceptions.
A sudden and relatively severe drop in altitude made her stomach flip, and she gripped the armrest so hard the fabric pattern imprinted itself on her palm. She felt dizzy and found herself breathing with quick, shallow breaths. It took a moment for her stomach to settle after the plane leveled out, and she didn't need to rely on her nursing degree to tell her that her heart rate had shot way, way up.
Liz looked at the other passengers around her. They were totally and completely unfazed - every last one of them. She cursed under her breath: next time, she would just take the extra day off work and drive rather than fly. A magnificent feat indeed that engineers could keep a million pounds of metal airborne, but such a shame that they couldn't make it at least tolerably pleasant for her.
As her heart rate began recovering, her need to pee returned with even greater severity than before. She had to pee so badly now she felt wet. In fact... glancing down she noticed a wet patch on her light blue shorts, peeking out just slightly above the level of her crotch and continuing down between her legs and underneath her. She moved her hands to cover her lap as quickly as she felt she could without attracting attention.
Viewed from the top or front, the wet patch would hardly have been visible. People probably wouldn't even notice unless they looked specifically for it. However, some discrete probing with her fingers confirmed her fear that the backside was considerably worse off. Viewed from the back, no one could miss what had happened to her.
The dampness between her legs made it even more difficult to continue holding, but Liz tried her hardest. After another 20 minutes of crossing and uncrossing her legs, tapping her feet, and keeping at least one hand in her lap at all times, Liz realized she had begun to attract the attention of the other passengers around her. A couple of them kept glancing in her direction and then looking quickly away. Clearly they understood her predicament.