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Harry waited until they were finished, and tried to hide his amusement that the two men were embarrassed at being caught in a girl's bathroom. He moved to the bank of sinks and waited for them to join him. "Open" he hissed at the small snake engraved on one of the taps. With a grinding sound, the sink began to recess into the floor. As the noise stopped, a large passage leading underground was revealed.

"The first time I was here, I just jumped down and slid down the pipes," he began.

Immediately, Dumbledore leaned over the hole and jumped. A loud "Wheeee!" was heard, gradually becoming more faint as he slid further away. Several long seconds later they heard him shout up, "I haven't had this much fun in years. Do come and join me boys!"

Severus closed his eyes and shook his head slowly at the old man's antics. He looked at Harry and asked, "You began to say that your first time you jumped down, Mr. Black. What about subsequent times?"

Harry chuckled and said "Stairs" in Parseltongue, followed by "Lights". The stairs appeared, lit by torches and Severus proceeded sedately down them, followed by a grinning Harry.

At the bottom of the stairs, Albus looked at them with disappointment in his eyes. "You passed up the opportunity for the best slide I've enjoyed in years, Severus. I think you should try it. You could use more fun in your life."

"We have different ideas of what constitutes entertainment, Headmaster," said Severus severely.

http://www.fanfiction.net/s/6610684/12/