Panty pooping

I was waiting in the que at the post office and the a young lady in front of me was really hot looking. She had long blonde hair and a slim figure. Her skin tight grey leggings she had on hugged the shape of her tight little bum and there was a very visible panty line showing through the material. She was fidgeting around a lot and there was a faint smell of poo In the air. I knew she needed the toilet badly and I secretly wanted her to have an accident in my knickers. When she got to the front of the que she asked if she could use the toilet as she was desperate but the woman behind the counter said she couldn't let her due to security rules. The young lady was leaning forward on the counter and she started wetting herself as a lump formed in the back of her leggings. The lady left the shop quickly and I couldn't wait to get home and pleasure myself.