It was evening, and the rain had been pouring for over 18 hours. Mid-April or no, this was ridiculous, and everyone regretted having to stay inside. Harry had just finished a potions lesson and was on his way back to the common room was he was stopped by Professor McGonagall while passing by the Great Hall.
"Oh, Potter, there you are. The headmaster would like to see you in one of the dungeon rooms. Please come with me," she stated professionally and began to walk back the way Harry had just come. Harry knew something was wrong, and tried to sneak away but McGonagall noticed too quickly. "Potter, the dungeons are this way. Please come with me, you can drop your things off later." Harry sighed heavily as his next excuse was immediately disapproved before he could even use it and he was forced to follow the old teacher back into the dungeons.
They arrived at a worn out door in a back hallway. McGonagall ushered him in and Harry had no choice but to follow her orders. When he entered the room, his suspicions were immediately confirmed. The headmaster was standing in a robe in the middle of a room full of odd devices that looked similar to torture devices. Once the door was closed behind Harry, the headmaster pointed to the door and Harry heard it lock behind him.
"Can't have people barging in on our fun, Harry. I've obtained a few new toys, would you like to try them out? My old bones can't quite take the fun they used to," the headmaster's raspy old-man voice echoed lightly through the stone room. He issued a slight chuckle as Harry looked, horrified, at some of the devices in the room. The various devices could hardly be discerned from torture devices except for the lack of sharp or pointed ends. They had many prodding parts, squeezing contraptions, and ropes upon ropes, and Harry wanted no part of any of it.
Dumbledore let off his robe to reveal that he was wearing a topless dominatrix outfit, complete with fishnet stockings and high-heeled boots. Harry almost cried as Dumbledore approached him and led him to one of the odd machines. This specific machine was simple, consisting of a chair with 4 straps, one for each arm and leg, and a hole in back-center of the seat. The headmaster half-forced Harry into the seat, and he reluctantly was strapped in.
The chair began to whir faintly as Dumbledore pulled down Harry's pants to allow the chair room to work, and something began to immediately prod through the hole in the chair right into Harry's ass. After a moment of that, Dumbledore tapped the back of the chair lightly as the prodding went deeper, albeit slower, and Dumbledore sat down on Harry's lap facing him, straddling his legs. Harry was shouting but the room was probably magically-soundproofed, since Harry could hear other students occasionally pass by the door between his shouts of pain.
"Don't sound like you don't enjoy it, Harry," Dumbledore whispered into Harry's ear in an attempt at being provocative while his wrinkled hand caressed Harry's face. "Here, let me help make it enjoyable." His tongue began to tap at Harry's ear while his old body began moving back and forth on his lap, all the while the strange chair prodding his anus far deeper than he could ever find comfortable.
While this was going on, the door to the room became unlocked and Professor Snape casually entered the room and closed the door behind him. He turned and saw what was happening, and fell back in shock.
"Oh, hello Severus, it's been a quite some time," Dumbledore stated quite matter-of-factly without stopping either the chair or the humping motion. "Would you like to join us?"
Snape fell backwards against the wall and began muttering something incomprehensible. His breathing became slightly erratic and, somewhere between Harry's painful hollering, Snape screamed.
