A/N: Severus' point of view.
Severus put his arm around Nymphadora, smiling slightly as she lay her head upon his shoulder. Kissing her forehead tenderly, he pulled his wand out and had the door close, canceling the 'notice-me-not' charm that was inlaid to his office's wards. I could have told her that nobody could have peeked in, but where's the fun in that? He mused as her hand wandered aimlessly over his chest.
"You are quite welcome, Nymphadora. I feel, however, that I should be the one to thank you for that. It has been quite a while since I've brought a girl to orgasm from a whip, not to mention the thrill I get from placing a collar upon you."
She turned her head to face his, and her eyes shone as they looked at each other. "I don't mind the collar at all, Sir. It makes me feel... special, I suppose." Her hand trailed down to a lump that was unmistakable proof of how excited the Defense Against the Dark Arts professor was. Her smile smoldered into a knowing smirk. "Very special, indeed."
Severus kissed her tenderly as her fingers lightly traced over his constrained erection, and he shifted his weight in order to straddle her and pinned her wrists down to the floor as his hips began to rock in a suggestive manner.
His beautiful witch, his submissive, lay naked beneath him as she bit her lip in anticipation, her breath and breasts rising as Severus' mouth affixed upon her neck and he bit her slowly. He was deliberately working the both of them to the very edge of frustration before he would thrust himself into her to the hilt.
"Severus..." She moaned, not fighting to have her hands freed but yearning to touch him, hold him, and wrap her legs around him possessively. She didn't finish the sentence, but the look on her face said it all. He, too, was raw with need and desire for her. It was a testament to his patience as he planned out the excruciating path his mouth and teeth would take, the slow trail down her collarbone, breast, and side, until he finally let his lips nip upon her most sensitive area.
As he released her neck from his bite, his hard cock rubbed itself traitorously against her wet quim though his thick robes. His lips began a trail of kisses and nips as he reached her left breast eagerly as his heart felt constricted in some sort of magical vice. Rolling off of her, he doubled over in pain as the squeezing sensation had him in a fetal position.
"Are you okay, Sir?" Tonks' voice was confused, threaded with a bit of panic.
Severus staggered to his feet, unsure as to what was happening to himself. A distant shriek pierced the relative silence.
"MURDER! MURDER IN THE BATHROOM! MURDER! DRACO!" The shrieking voice of Moaning Myrtle had Severus' eyes widen as the realization hit him. The Unbreakable Vow he had taken included protecting Draco, and it was poised to kill him if he didn't go save his godson.
Nymphadora sprung up as well, gathering up her clothes and quickly dressing as Severus cast a tracking charm to locate Draco.
"Another attack in the school? Who could do this?" She asked, hopping into her pants as she reached for her boots.
"You will remain here; I must take care of this." Severus replied, wrenching his door open and swooping through the hallway as if pursued by the devil himself.
"THE HELL I WILL!" Tonks shouted as she shoved her other boot on and tore off behind him.
Severus flicked his wand angrily over his head, erecting an invisible barrier that the Auror crashed into. "No time to explain..." He muttered angrily as he got to the grand staircase and rushed off towards the dying Malfoy.
Moaning Myrtle's screaming sobs had drowned out a thoroughly confused and livid Nymphadora Tonks, who was trying to figure what Severus wasn't telling her.
As Severus entered the bathroom, he saw the white-faced and trembling body of Draco Malfoy. As he had feared, the boy would soon be dead if drastic measures weren't taken. Harry Potter was standing in the corner, dumbstruck at the sight of his childhood nemesis bleeding out onto the floor.
The convulsions he had been experiencing hasn't lightened any, but he had been able to hold his wand steady as he knelt over the boy and sang the incantation to re-knit flesh. Scarring was very much a possibility, seeing the depth of the slices Potter had made. So was death, but Snape didn't want to dwell on that possibility. His wand traced over the cut flesh, and his hands betrayed a slight tremor as he had to repeat the incantation over the wounds a second time. How did this boy cut Draco so deep with my spell?
Blood loss was another immediate issue, but Severus didn't have a blood-replenishing potion on himself. The wounds were still seeping red.
This HAS TO WORK! He thought in a blind panic, singing the incantation over the wounds a third time. The skin had turned a waxy red as if melted to make a seal, but the flesh was mended.
"You need the hospital wing. There may be a certain amount of scarring, but if you take dittany immediately we might avoid even that... Come..."
Severus put his arm around Draco, supporting his weight as he got the boy onto his feet. Harry Potter had simply stood there and did nothing as Draco had been slowly dying. Severus' rage had boiled over; the memories of James Potter's cruelty fueling his cold fury as he looked at the son with complete loathing.
"And you, Potter... You wait here for me."
It was a blur to Severus as the students had hugged the walls as he took a blood-drenched Draco to Madam Pomfrey. He was sure that he had knocked over a second-year Ravenclaw who had been reading while in the hallway, but didn't look back to be certain.
"Severus? What in... MERLIN'S..." Poppy shrieked, but was drowned out by the booming voice of the Bat of the Dungeons.
"BLOOD-REPLENISHING POTION. NOW." Severus laid Draco out on a hospital bed, vanishing away the torn remnants of his shirt. "Accio dittany." He murmured with a sharp slice of his wand.
The Medi-witch hurried over with the potion that Severus had barked for, and began administering it to Draco. "Severus, what happened?" She asked in horror.
Snape sighed a deep relief as the dittany removed most of the scars on contact. "Harry Potter sliced my godson open and stood there to watch him die." Severus' voice was foreign to him, devoid of any emotion including the rage that he had harbored earlier.
"Harry? How would he even know a Dark Spell like this?" She asked, bewildered.
"I plan to extricate that from him before he gets sent to Azkaban to await trail." Severus rushed out of the Hospital Wing and his mind reeled over the orders he had to follow and the delicate dance he had to do in order to survive both of his masters.
"Go." He said to the offending ghost as he faced Harry.
"I didn't mean for it to happen," Harry said in a frantic rush, "I didn't know what that spell did."
So you used it anyways? I always thought Ronald Weasley was the berk of the trio.
"Apparently I underestimated you, Potter. Who would have thought you knew such Dark Magic? Who taught you that spell?" I wouldn't be surprised if Sirius told him on a lark.
"I... read about it somewhere." No...
"Where?" Severus wanted to simply ask, 'Where is my book?' but couldn't risk associating himself to it.
"It was... a library book. I can't remember what it was call..." Severus rolled his eyes at this. The spell was younger than most books in the library.
"Liar." Severus' eyes locked onto Harry's and he delved into the boy's mind. The boy's first thought was of his old, worn copy of Advanced Potion Making.
"Bring me your schoolbag, and all of your schoolbooks. All of them. Bring them to me here. Now!"
As Harry left, Severus reminded himself that Albus wouldn't allow Harry to be suspended from Hogwarts, much less arrested by the Ministry and his wand confiscated until a trial. Any punishment would simply happen here at Hogwarts and would never see the light of day. The Chosen One would retain an unblemished record, just as his father did.
Severus' mind devised the most sadistic punishment yet for the Golden Boy. He could learn exactly what kind of 'good man' his father was, and how he had inherited his father's proclivity for being an arrogant bully while everyone pretends that he's innocent.
In the midst of his fear of dying over Draco's fate and his rage at Potter's ability to weasel out of responsibility of his actions, he had completely forgotten about Nymphadora.
What was there to say? What could he even tell her? It would all end soon enough, and perhaps it would be better to simply avoid her until then. Until he had to kill Albus in order to protect Draco again.