Draco found himself needing a loo very badly. Normally he would have just gone behind a bush and used a few charms to deal with it but as he was still on probation he had to do things the muggle way. The normal loos in the park were closed so he had to use a porta-loo.

He had just sat down when he realized he could not lift from the seat. A small voice in the back of his head started screaming warnings as he struggled when there was a small

Hermione looked up from the bench as people screamed and pointed. A porta-loo had suddenly lunched itself into the sky on a pillar of flames trailing smoke and ashes. She smiled with a satisfactory grin before resuming her walk. "Who's got the dirty blood now bitch."

...

Arriving Home her husband Harry kissed their daughter on the head and asked his lovely wife, "How was your day at the park?"

"Oh quite, enjoyable. You might even say it was a real blast." Then laughed maniacally.

As Hermione had been spending a lot of time with her friend Luna Harry just smiled politely and went upstairs to change clothes. Deciding that there were some things he just didn't want to understand.