S is for Sacher-Masoch

Harry was seated in his usual uncomfortable armchair in the potions classroom. His behind felt a bit sore, more from the last Occlumency lesson than from the hard wooden seat of the chair. Snape was standing by his desk with his back turned towards Harry, stretching his wrists and finger joints in preparation for the wand waving he had once called “foolish”. Suddenly, he faced Harry and came towards him, his thin, black wand outstretched.
“Shall we warm up as usual?” he asked and raised his wand at Harry without awaiting a reply.
“Professor!” Harry interrupted him.
“Yes?” Snape lowered his wand and came and stood right before him.
“I – I think I’m ready to move straight onto moment number two.” Harry boldly placed his hand on the professor’s groin and felt something stir.
“I will have none of this insolent behaviour.” Snape said, but he didn’t remove Harry’s hand.
Harry swiftly undid the row of little black buttons and took out his teacher’s stiffening sex. He had a plan. The plan was to surprise Snape, throw him off balance, catch him off his guard. To penetrate him. Not literally, of course, that Harry didn’t even dare dreaming of. He took his tutor’s cock in his mouth and sucked on it.
“Have it your way.” Snape said and immediately proceeded to invade his mind.
What if he saw what Harry was up to? Harry hadn’t thought of that. But Snape usually fished out older memories during his raids into Harry’s mind, and he showed no signs of being aware of Harry’s cunning plan. Not that his showing no signs was a sure sign of anything. He did after all master the noble art of self control. But Harry had shown quite a propensity for the less noble art of cock sucking, and he could feel the force of Snape’s attacks weaken.
Now would be a good time for a counterattack, but he could not utter any spells with a cock in his mouth. He hadn’t thought of that, either. But speaking wasn’t all and he could still think them. Perhaps merely thinking the words would give Snape less time to prepare.
Having his tutor’s cock in his mouth also put Harry in control in a way quite different from having it up his arse. He could feel the first drop of salt on his tongue and focused all his energy, all his power on retaliating, reversing the attack upon his mind.
Then it happened. As the semen flooded his mouth he burst through and entered the professor’s mind.
He felt… desire, knowing it wasn’t his own but Snape’s. He felt the sweetness of… surrender. Surrender? To what or whom would professor Severus Snape ever surrender? To the dark lord himself?
Harry stepped back, realising he had somehow been inside Snape’s body and was now stepping out of it to get an overview of the scene. At first he sort of raised his torso out of Snape’s and saw his head before him, cheek pressed against a black marble surface, brows knit, lips parted over clenched teeth. Then Harry disentangled himself completely from Snape’s body and saw someone standing behind him, between his parted legs. Harry tried to walk around the couple to get a better look, and noticed he could indeed do it, although he felt eerily disembodied.
That someone standing behind Snape was Lucius Malfoy. He had both of Snape’s hands locked behind his back in a firm grip, but Harry knew this to be a mere formality. Still somehow one with Snape’s thoughts he felt it to be very polite of Lucius to thus free him from responsibility for the situation. With his free hand, the left one, Lucius used the serpent’s head on his cane to remove the strands of dark hair from Snape’s face.
“You quite enjoy this, don’t you, Severus?” he asked, his lips curled into a cruel grin, “I bet you feel right at home in this position.”
Snape didn’t reply, merely closed his eyes and drew his breath. Harry could feel with him a wish that Lucius would shut his mouth and just… have him!
“Very well.” Lucius said, as if he, too, could read Snape’s mind, “I shan’t disappoint.”
Sure enough of his victory to let go of Snape’s hands, although not of the wand enclosed in his cane, he bared Snape’s bottom and took out his own hard cock. Harry felt a surge of anticipation that nauseated him, nauseated him because he knew it so well. He could feel what Snape felt when Lucius cock slid inside him, which was - almost – like being fucked by Lucius Malfoy directly.
“Enough!”
It was Snape’s voice, but the Snape Harry was feeling with certainly hadn’t had enough. If he’d beg for anything, he’d beg for more.
The whole scene began crumbling and Harry found himself once again in the chair in the potions classroom. Snape was breathing raggedly and hastily tucking his cock back into his trousers. He had a wild look in his eyes that Harry didn’t recognize. Harry felt small and quite crushed, instead of powerful as he had expected. What had he done? What in the heavens had he done?
“I – I’m sorry.” he stammered, “Honestly, I didn’t mean to –“
“Get out.” Snape uttered in the most fearsome voice Harry had ever heard, a voice which made him automatically stumble to his feet and toward the door.
“And do not come back. Ever.” was the last words he heard before the heavy door slammed shut behind him.