Things are escalating a bit now...

Disclaimer - I own nothing of these character.

Detention with Miss Granger, I should make the chit scrub cauldrons for the 2 hours I mused angrily to myself. Unfortunately Poppy had reminded me at lunch that the infirmary was low on Burn Salve and Pepper-up potion so the practical thing to do is to engage Miss Granger in assisting me with the brewing. Setting up the cauldrons and collecting the ingredients I let my mind wander to the upcoming meeting with the Dark Lord this Friday. For the first time in many years I was truly fearful of the outcome. Despite being a double spy, in constant peril of being discovered and thus killed lately I was more fearful than I have been in recent memory. This madness of the Dark Lords had me unsettled. Before this he was often easy to read, his moods I could decipher and adjust my behaviour accordingly. But now… This was unseen territory…

My depressing thoughts were interrupted by a tentative knock on the classroom door. Upon checking my pocket watch and seeing it was indeed 8 pm I called out for Miss Granger to enter.

'You may come in Miss Granger'

The girl entered quietly, wide eyed and nervous over what her detention would entail.

'You will assist me in brewing some much needed potions for School Matrons infirmary. The two potions will be a basic burn salve and Pepper Up Potion. I trust as a Newt level student you can complete these potions without assistance?'.

'Yes Professor Snape' the girl said confidently, surveying the ingredients and lighting the cauldron fire.

I set down behind my desk and set about grading some first year essays. Every year the students never fail to research properly the twelve uses for Dragons blood.

I found my eyes being pulled to the girl, The pepper up fumes wafting over her face, dampening her curls and flushing her face a pleasant pink colour. It was at this opportune moment that she took off her school cloak, leaving her clad in her school blouse and skirt. It seemed to be of my opinion that she had been through some sort of recent growth spurt. Her blouse seemed too tight against her chest. Her breasts all too evident for my perusal, I could see the black lace bra peeking through the eye hole between the two buttons taunt with her curves.

I swallowed nervously all too enraptured in the swell of breasts, watching the beads of sweat formed from the potions fumes, make their way from her neck and slide into her cleavage.

I was shaken from my reverie as I realised the girl was calling my name.

'Professor Snape sir, Professor? Professor the salve needs to cool and the potion needs to simmer for half an hour before the next step. What should I do in the mean time?'

Disturbed to have found myself staring at a students breasts I snapped at her to sort out the store room. Then at least she would be out of my sight.

Trying to return to the marking of the first years essay I couldn't find my focus and kept thinking of that temptress in her school outfit only feet away. Rising suddenly I couldn't help but stalk over to the store room door as I watched her move around the glass jars, sorted methodically and carefully.

She was reaching for a top shelf, her back facing me, struggling to reach a jar just out of reach. Her shirt was riding up her lower back and her skirt which like her shirt had been subject to her growth skirt was hitching up the back of her thighs. I watched it steadily climb up her leg, revealing more as it went. I was entranced… Eventually the skirt reached just above the curve of her bottom, I could just see peeking out from underneath some black lace knickers and I let out an audible hiss. The sound startled her and she drew back suddenly taking the glass jar with her and it fell on the floor and shattered into a thousand pieces. One particularly large shard flew violently from the floor and found its way cutting the chits leg. She staggered against the shelves, somehow being mindful not to smash the rest of the jars.

'Oh Professor Snape I'm so sorry!'

'Ridiculous girl! you've ruined a perfectly good jar of Hellebore is what you've done!'

'I'm sorry please don't be mad, but I think I need to see Madam Pomfrey for this cut though…'

'I am perfectly versed in healing charms Miss Granger, come along hop up on my desk and I'll have a look at your leg'.

She limped over to desk and scooted herself on the edge. I crouched beneath her legs, struggling to maintain a sense of composure in this compromising position.

'Miss Granger you will have to part your legs slightly so I can see the cut'.

I watched her audibly swallow and slowly she parted her legs and I very softly touched her leg to try and soothe her. She jumped slightly at my touch. Of course she would be disgusted by her old professor touching her bare skin. The greasy bat of the dungeons is not high on the crush list of teenage girls. As I set about cleansing and knitting the wound closed with my wand I got a whiff of a smell I had not smelt in many years. It look my sluggish brain a few seconds to realise exactly what my discerning nose was recognising. It was the smell of female arousal.

I finished healing the cut, slightly dazed and confused. I rose quickly, leaned in to her person and looked into the girls eyes.

Quickly skimming the most immediate of the girls thoughts, not being too intrusive in her mind for her to be aware of my presence I snatched glimpses of some unexpected images.

They were all of me, of me and her and some extremely erotic situations. Me fucking her on this very desk, me fucking her in the alcove I had accosted her in the previous night, me fucking her in the store room. The girls mind was a treasure trove of pornographic fantasies, all staring me.

I staggered back, much to the girls confusion.

'Apologies Miss Granger but I remembered I had an appointment with the headmaster this evening. Could you please finish up these potions and take them to the infirmary. Your leg should be healed appropriately but if you have any concerns you can ask Madam Pomfrey to have a look for you'.

Without waiting for a reply I stalked off into my study, through the next door and into my private chambers. Undoing my fly and pulling down my boxers I grasped my erect cock and started pumping. The girl was not innocent, no she was dirty, a filthy girl with her filthy fantasies. They all flitted across the back of my eye lids and I groaned as I neared completion. The final image was of me reaming into her from behind, her crying out in pleasure beneath me. I came with an almighty roar and collapsed into my armchair. Wandlessly scourgifying myself I settled in for a night of self loathing by the fire.