She goes to the one on the third floor

The line looked too long for Mai, and her intestines wouldn't hold until she got in, so she walked as fast as she could to the stairs.

After running for a couple of minutes, Mai felt exhausted. She had run to try to get there as fast as possible, but she was a little tired after that race, but at least she had reached the stairs.

The bathroom was right at the front of the stairs, she just needed to climb them and she would be there.

However, her stomach would not stop gurgling, nor her intestines from growling. Mai knew she would be in a serious bind if she didn't climb the stairs fast.

Mai set out to climb the stairs, but every time she lifted one foot to climb the step, the pressure in her intestines increased, and the farts began to come out with each step she took.

"Come on, just a little longer, hold on" she told herself.

The farts became wetter and the pressure stronger. Halfway up the stairs, Mai was **** to stop. She was, literally, at her limit. She could feel her poop poking out of her anus.

"Come on Mai, you can do it, just hold on a little longer, you're very close"

Mai tried to climb quickly, but the pressure was preventing her. Until finally she couldn't take it anymore.

The last fart that came out of her anus was not exactly a fart, and that caused an avalanche of liquid shit to come out of control, filling and overflowing Mai's panties.

Mai froze in shock. She had been so close, but she didn't make it.

Mai crouched in place and began to cry, feeling humiliated.