Once Binns had floated through the blackboard, taken roll and begun droning on about Burrod the Bludgeoner or Bigrod the Beguiling or whichever goblin had done something noteworthy, Harry set to work.
He surreptitiously pulled out his wand and stuck his parchment to the desk so that he could take notes without having to use two hands.
Then he casually reached over and slid his left hand in between Gabby's legs.
She tensed, guessing what was coming and not willing to stop it.
Harry was aware that she knew she could put an end to it at any time and he wouldn't be angry with her, but he also knew that she would do everything in her power to obey the command he had given her.
He also supposed that she was never more aware of the ease with which she could draw the attention of the entire class to her.
Slowly he drew across the smooth flesh of her inner thighs with his fingertips, drawing invisible patterns that clearly illustrated the power of touch.
He saw her bite her lower lip and swallow nervously, determined to remain silent.
Harry intended to take her to the very precipice of her resolve.
She watched him closely but he was fixated on the trail of the moving fingers almost as though trying to find meaning in the random design they drew: halfway up her left thigh, circle around, over to her right thigh and draw looping swirls down to a point just above her perfect little knee; back to the left thigh and brushing around to the outside of her leg, then a straight line up to her hip, then forward in a downward curving arc that evolved into a zigzaging pattern that worked it's way diagonally to the inside of her left knee.
Her leg twitched.
Apparently, she was ticklish.
He brushed the same tender spot with the back of the nail on his index finger.
Another twitch, larger than the first.
He looked up into her eyes.
She was silently begging him to both stop and continue.
Dorvan the Devastator and his forces decimated an entire wizarding village in December of 1672.
Harry made a point of getting Gabby's attention before making her wait as he wrote that down, drawing her notice away from his other hand which he carefully rotated so that it faced the other direction.
Before he was finished writing, and without giving her any indication or warning, he brushed his fingernail across the same spot, though on her other knee, repeating his little test.
The jerk was so pronounced as she flinched away from the tickling digit, that she nearly lost her balance.
She caught herself and wrenched her body up straight again.
She worried her lip and closed her eyes giving the impression that she was silently praying that she was still unnoticed.
Harry smiled and gave her no time to recover.
He started his fingertips dancing across her soft, young flesh again.
He pretended to pay attention to the spectral professor, occasionally scribbling word-like patterns on his parchment with his uninked quill.
His mind, however, was on his left hand and the path it described as it traced its way over her thighs and lower abdomen circling inexorably towards it's destination.
She was clearly lost to the sensation now.
Unconsciously, she would move herself ever so slightly in the direction of his contact with her skin.
Her eyes remained closed and he imagined that any number of erotic images flitted across her vision on the inside of her eyelids.
He was closer now, inches from his goal, but still patient enough to prolong the teasing and heighten her state of arousal.
Millimetre by millimetre he closed in on his target.
Gabby's mouth was open and her lips were moving silently.
She appeared oblivious to everything but the touch of his fingers.
Her slit was clearly damp and threatening to begin dripping.
Finally, he dragged a single finger down one side of her fleshy pudendum.
Harry could see her breath hitching as the muscles in her stomach clenched.
He moved his touch back out to the distance it had been moments before and circled her sex with swirling motions.
When he'd worked his way back up to a point between her bellybutton and her cleft, he again trailed a single finger down, this time on the other side of her bald slit.
Again, her belly spasmed involuntarily.
This time he didn't move away, but trailed little patterns around her plump mound.
She was breathing heavily, but doing her best to do so silently.
Her hands were performing an interesting ballet of their own as they alternated between curling into fists, catching her thumbs with her fingers, making claw-like shapes with tightly bent fingers and stretching as wide as possible; she clearly wanted to touch herself and was barely able to keep from doing so.
He finally slipped his index finger into her slit and ran it down, gliding past her entrance without trying to slip inside.
It was instantly coated in her secretions.
He began sliding it back and forth, sometimes acting as though he were going to slip it into her channel, but refraining from actually doing so.
She was back to biting her lip and she was breathing through her nose just hard enough that he could hear it.
She rotated her hips forward in an attempt to cause his finger to come in contact with her most sensitive area, but he allowed his caressing fingers to move right along with her; she stifled a grunt of frustration.
He glanced around to see if anyone else heard it, but in truth, most of the students were either dozing or daydreaming, and the professor likely wouldn't have noticed if Harry took half the girls in the classroom right there on the ghost's normally disused desk.
He added a second finger sliding along between her outer lips, gathering her juices.
She appeared to be fighting a battle between wanting to force more contact in effort to find her release and allowing her Master to tease and torture and pleasure her as he wished.
Her eyes opened in loss when he removed his fingers from her sex and widened in shock and lust when he brought them to his mouth and casually sucked them clean.
As soon as he could taste no more of her he returned his hand and continued his slow, deliberate rubbing.
She was now begging him with her eyes.
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