Wash up

She stormed off to the bathroom. As she did the wet patch spred across the dress. Once she reached the bathroom she locked the door and looked in the mirror. She noticed the patch was all over her dress.

"The hell?" she said. Suddenly at her ass the dress exploded. Her blue thing exposed to the air. She covered it with her hands. She waited for a whole 3 minutes but nothing else fell off. She had to get out from the party before anyone elses knew she has her ass hanging out with only a small thong keeping her dignity. She looked out the bathroom, she was on the forth floor so no way she could climb out. She unlocked the door and peeked her head out. A few guests were in the hall but not many. Maybe if she ran she could escape? Or maybe if she acted cool but kept her ass against the wall? Or even if she found a bedroom she could put on better panties that covered more, add some extra cloth to the dress and play it off as a design and get out before anyone realised it wasn't?