A few weeks had passed since the field trip, and Abi and I hadn't been alone together since. Something had always seemed to get in the way.

On Friday, our illustrious head teacher, Mr. Knowles, had scheduled a staff meeting for the Friday afternoon after the final lesson, which did nothing to help his declining popularity amongst the staff.

The following Friday, I was ill, and a substitute teacher took the class.

Abi messaged me with a sad face emoji and said she would have to get a nurse’s uniform and come to my flat to look after me. The idea of her dressed as a nurse got me hard right then and there.

On Monday, I was better and returned to work, to be greeted by an overflowing email inbox and a well-stuffed pigeonhole.

The headteacher had decided to send out the mock exam papers externally for marking, and as I flicked through them, I was pleased with the excellent grades achieved by my students, except for Abi’s.

All her classmates had scored 75% or higher; hers was marked at 30%.

She had barely written anything; it was neat, and the points she had written were valid, but there was just so very little writing, not what I would have expected from her for an hour’s exam.

I began to worry that our "relationship" was affecting her studies and felt guilty as hell. Sure, I was enjoying the attention, and the sex with her was amazing, but I didn't want her future to be affected by what we were doing. I pulled out my phone and typed, then retyped a message to her asking if everything was ok and what had happened in the mock exam.

She replied almost instantly, "What mark did I get?"

"30%," I replied.

She replied with a champagne bottle emoji, "Yes! It worked, all part of the plan," and added a finger to the lips emoji.

I was too confused and tired to reply, so I left it at that.

The following week was parents' evening, meaning I had 17 short appointments with parents on the Wednesday after school, the very last one being with Abi’s parents.

I was nervous as hell about coming face-to-face with them.

Abi had said very little about them, other than her Dad ran his own business and was always working; out of the house by 7 am usually, and seldom back before 7 pm, then playing golf most weekends.

Her mother was similar, always working away on her laptop or her phone, and I got the impression Abi was unhappy with her home life, despite her family’s wealth and their large house.

It is amazing how well-rounded she appears to be considering what her parents are like, but on the other hand, she had pursued and seduced her English teacher in a classroom, and had sex in his car and a hotel room. How many 18-year-olds would do that?

I got through the 16 other appointments without any issues, the apprehension about the final one being a constant at the back of my mind.

All my students are good really, you don't get many time wasters in the sixth form, especially at this school, so it was not a difficult task to sing their praises, which is exactly what the parents wanted to hear.

When the time came for Abi’s parents’ appointment, they did not appear.

I wandered outside to the corridor and checked they weren't sitting waiting on the seats that had been placed there.

There was no sign of them.

I waited.

10 minutes passed, and still nothing, intrusive thoughts began to creep in, were they sitting with the headteacher at this moment, having somehow discovered mine and Abi's secret?

I checked my watch; they were 20 minutes late. Maybe they weren't coming. I pushed the worry out of my mind and was just starting to pack up my things when a man and woman walked into the classroom.

"Right then let's try and sort this out," boomed the man's voice as they both sat down.

He was a tall, rather overweight man, with receding grey hair, wearing an expensive-looking blue suit that barely held his gut in place.

The woman with him was tapping away on her phone rather distractedly, wearing a grey suit with gold buttons.

"Good evening," I said, "You must be Abi’s parents?"

"Yes yes, I'm afraid we got held up, I was having a fascinating conversation with Mr Knowles about our wonderful Government," he said, prefacing the wonderful by making quotation signs with his hands.

"I can't understand what they are playing at. You see in my line of business..."

I zoned out a bit as he talked without stopping for several minutes, referencing various policy changes, taxation, workers’ rights, and a whole manner of other things before I was eventually able to get a word in.

The woman didn't speak at all but continued to tap away on her phone.

"So....Abi," I interrupted.

"Yes, well, we are very disappointed in her mock exam mark," he said, glaring at me as if it was my fault.

"Very," agreed his wife without looking up from her phone.

Her father continued, "She needs to buck her ideas up in English. Everything else is going fine but she's gone backward here for some reason. Any ideas?" he questioned in a rather accusatory tone and with a piercing stare.

I figured his attitude towards me wouldn't exactly improve if he knew I'd been fucking his daughter so for obvious reasons didn't mention that.

"I think she needs to take more time and care in her work. She's clearly very intelligent but didn't explain herself with enough detail in the mock exam," I said, which was the standard line we trot out.

There wasn't anything else to say as her normal work was great, it was just this exam which she had apparently deliberately sabotaged.

"Well, Abi suggested she might benefit from a little extra tuition in English; she even thought you might be interested in helping out."

I managed to keep a straight face despite being surprised at this suggestion.

Was this the 'plan' Abi had referred to? She was something else, this girl, working her parents like this.

"If you think it would help, then I could spare a few hours at the weekend," I suggested innocently.

"Excellent, that is settled then. Come by the house this Saturday, I'm afraid I am busy all day, and my wife is away as well, but you and Abi can use the dining room as your classroom. If you come over around, say 11, she has a tennis lesson from 10 to 11, I believe."

"Yes, tennis is 10 to 11," confirmed his wife again without looking up.

"Right, we shall bid you good night," he said, rising to his feet.

He shakes my hand, after which I find a business card in my palm, "I've written our address on the back. Goodbye."

"Have a good evening," I say as they leave, slightly stunned at what has just happened. I took out my phone and immediately messaged Abi, saying, 'Looks like we'll have 1 to 1 session on Saturday ;)'

The lesson on Friday came and went, Abi looking a million dollars as ever, her tight-fitting uniform accentuating her beautiful body, her curves drove me wild, I was enjoying getting to know them intimately.

But as she was getting picked up straight from school by her mother to go somewhere so I would have to wait until the following day for my fix of her.

Saturday morning was bright and sunny, I had a shower, got dressed, had breakfast then got in my car and drove to Abi's house. There were already 2 cars on the substantial drive, so I parked on the street outside, walked through the gate, and rang the bell.

Abi's mother opened the door, dressed to the nines in a dress, a mobile phone glued to her ear, and a small suitcase just inside the door.

"Yes yes come in," she said impatiently and beckoned me inside. She held her phone to her chest and said, "Abi is just finishing her tennis lesson and will be in shortly, please take a seat. I am just off out...do try and get the girl to concentrate," she said with a roll of her eyes.

She resumed her phone call, grabbed her case, and walked out the front door, closing it behind her. I heard a car door open, then close, and an engine start up before it faded away, and the only sound was the ticking of a large clock on the mantelpiece.

I had a brief nosey about the room, looking at the many family photographs, most of them of Abi's father shaking hands with other similarly attired men or family shots at birthday parties. I heard a door open on the other side of the house and then Abi shouting, "Bye Lucy!" before the door shut again. I assumed Lucy was her tennis coach as I could see a middle-aged lady through the window to the side of the house heading for the other car on the drive; evidently, the tennis court was somewhere on that side of the house.

I focused my attention back on where her voice had come from.

Then I saw her.

Maybe I am falling for her, I thought, I broke out in a massive grin as she half ran towards me, wearing a tight-fitting tennis skirt, short as anything, and a tight top, her toned midriff on show, her hair in the usual plait.

The outfit hugged her figure beautifully, accentuating her hips and breasts and I was spellbound.

"Do you like it?" she said, giving me a twirl, the material rising up as she spun around, giving me a flash of her pert bare buttocks before putting her arms around me and kissing me.

"I can't believe you've engineered this," I said, "Getting me into your house with your parents' blessing, there's no way they would have gone for this if they knew what we've been up to."

She laughed "My dad would call it playing the system. Now, what do you want to see first, my books or my tits?" she with her hands on her hips.

"I think perhaps your books just this once," I say, surprising myself.

Abi looked disappointed, but I pointed out that her parents may decide to check up on what she gets done when they return home.

It didn't take long for things to change though, as we sat in the lounge reading before a discussion point, I could feel her eyes on me.

"Come on, read the text and we can then discuss it," I said to her, but not with any real intent.

"Wouldn't you rather I was sucking your cock?" she said pursing her lips and tilting her head to the side.

"Of course I would, but..." I stopped. I couldn't think of a reason why I wouldn't want that and closed my book, "Ok, you've convinced me."

She grinned, threw her book to the ground, jumped up from the armchair, and leapt onto me on the couch, wrapping her arms around my neck and kissing me, "I'm already ready for you," she whispered in my ear.

I touched her face with my hand and pulled her towards me, kissing her, tilting my head slightly, and holding the back of her head.

"Come on then, suck my cock."

She climbed off me and lay down on her front of the settee at a right angle to me.

She giggled whilst trying to unfasten my jeans, I pulled them down and kicked them off.

"Shouldn't we go upstairs?" I asked, slightly worried that her parents may arrive home and find us in a very compromising position.

"I'm too horny and I want you now," she replied already pulling my semi-hard cock out of my boxers, "and besides they won't be home for hours."

She started to suck my cock, and any worries I had disappeared from my mind as I savored the experience.

"Touch me," whispered Abi urgently.

I stretched out my right hand, flicked the hem of her tiny skirt up and caressed her bare ass cheeks. Then I reached underneath and ran my fingers over the top of her thong, tracing the outline of her labia and clit.

"I love it when you do that," said Abi, momentarily taking my cock out of her mouth, before plunging her mouth back onto it.

I split my index and middle finger into a V shape and ran the fingertips on either side of her clit.

Abi gripped my cock tighter and pushed it further into her mouth with a moan.

I moved both fingers to the side of her labia and gently pushed her thong aside, making sure I slid my fingers across her clit as I did so.

She deep throated me as I did this, my cock hitting the back of her throat, and I involuntarily bucked my hips upwards and moaned loudly.

Then I slowly caressed her clit before sliding both fingers inside her. She raised herself up slightly and pulled my cock out of her mouth.

"Fucking hell Sir, you get me off better than I can do it myself."

Abi continued to suck my cock and moved her hips as my fingers slid around inside her pussy.

She pushed back further against my fingers and then sat up with them still inside her, rocking slightly, grinding onto them.

She then crawled towards me, raising her knee over my legs to straddle me.

"Now then Sir, I think you deserve a reward for being so good to me," she said with a smile.

She raised herself up and then lowered herself onto my engorged cock, slick with her saliva. I gasped as my cock slid effortlessly inside her.

"There," she said as she slid all the way down, "Doesn't that feel much better?"

She put her hands on my shoulders and began to ride me, kissing me and starting to get breathless. I could feel how hot she was getting as she started to ride me faster.

I was getting to know her body and realized she was close to orgasm already.

I ran my hands over her breasts and rubbed her hard nipples through the fabric of her tight tennis top, and pulled at the hem of the skirt, exposing her ass cheeks.

"I'm so fucking hot," she complained, leaning back on my cock and pulling her top over her head. I helped her take it off and dropped it on the couch next to us, then unclipped her front-fastening sports bra, my eyes lit up as her breasts spilled out.

"Oh fuck," she said as I sucked hard on her left nipple, as she continued to ride me.

"Yes! Yes yes!" she shouted, quickening the rhythm of our lovemaking as the heat between us started to rise further.

She was now bouncing up and down on my cock, and grinding her clit on me at the same time.

"Oh God, I'm coming," she howled as her body let go and she started to shudder. She moaned loudly whilst still rocking back and forth on my cock as her orgasm consumed her.

She kissed me, I could see her face, shoulders, and chest were flushed pink, her whole body glowing with heat as she came down from her orgasmic high.

"I want you to fuck me hard...from behind," she panted.

I stood up and she clambered off me, only just able to slip my cock out of her pussy she was so drained of energy, and I guided her back to the couch.

"On your knees," I commanded.

Abi grinned and said, "Oh yes fuck me, Sir."

She rested her knees on the couch and then arched her back. I knelt behind her, holding my cock against her clit, and slid it over her pussy lips teasing her.

"I need it inside me," she breathed and tried to push back against it.

"Patience is a virtue," I said, continuing to tease her.

I reached forward and took hold of her left hip, then held my cock to her pussy and gently guided the tip inside her.

Abi pushed back against me as I slipped all the way inside and she moaned loudly with pleasure.

"Holy fuck that feels good," she said.

I grip her right hip with my right hand and started to gently thrust in and out. I saw her knuckles whiten as she gripped the arm of the couch as I pushed into her, starting to go faster.

I looked down to see her pussy creaming on my cock as I gently but firmly fuck her pussy.

Every so often, I thrust extra hard inside her.

Abi panted and cried, "Oh Yes! Don't stop, I want you to cum inside me!"

I let go of her right hip and grabbed her hair plait, pulling it firmly to bring her head closer to me, her back arching.

With my other hand, I grabbed her left breast and squeezed it hard, tugging on the nipple with my thumb and index finger, still pounding her pussy with my rock-hard cock, my hips slapping on her ass cheeks.

"Oh God, I'm going to cum again!" she shouted, I pulled her hair a bit more and start pumping her for all I'm worth.

Her second orgasm ripped through her, she started to moan louder than before and started to quiver again.

That sent me over the edge, and after a few more hard thrusts, I unloaded inside her pussy, pulling back on her hair again as my orgasm peaks, so we were now almost upright as I filled her up with load after load of my hot sticky cum.

We collapsed in a heap and panted in unison before I planted a tender kiss on her hot pink shoulder.

I could feel the heat of her pussy on my cock as I slowly slid it out, my cum dribbling out of her pussy, down her thighs onto her discarded clothes.

Abi lay face down on the couch her beautiful ass in the air.

"Fuck," she said breathlessly, "I thought I was going to pass out".

She turned over and sat up, "I don't know why, but when you pulled my hair, it sent me over the edge, it felt so naughty," she said, her eyes gleaming.

I told her I sometimes think about fucking her over my desk like that.

Her eyes lit up. "That would be so hot."

God, I love this girl.

She suddenly said, "I have a great idea, why don't I come to your flat, I could tell my parents I'm staying at a friend’s house and stay the night?"

"How about next Saturday?" I suggested.

She clapped her hands together with excitement, "Yes, perfect! I can't wait. Now we'd better get dressed and clean up; my aunt will be here in about half an hour, and she'll go nuts if she sees us like this."

I stared at her open-mouthed. What a girl.