I pushed the child forward over my desk with one hand whilst unzipping my pants with the other. I flicked her dress up over her back then pulled the waist band of her pink panties down over her ass just enough to slip my rock hard shaft between her thighs.

My throbbing cock slid forward between Mandy's legs, parting her pussy lips then pushing up her bald mons, stopping at the elastic waistband in front. Her pussy lips were spread open at the base of my hard shaft and my pubic hair tickled her ass cheeks. Mandy crossed her legs squeezing my aching tool between her thighs. She slipped her hand between her legs pressing her palm on my cock as it pushed up between her pussy and the crotch of her tight panties.

Mandy had learned a lot over the two weeks since our illicit liaison began. We had met nearly every evening, the only exceptions were the nights she had after school club or had to get home early. She was insatiable! So was I! She had become more confident too and it had always been her who came to me.

Until today!

When the bell rang for recess she had given me the little wave that had become her secret signal indicating she would return after school, but unfortunately there was a staff meeting and I couldn't miss it. When I explained this to her she looked devastated. It was the first time I had turned her down! She obviously hated missing our fun sessions as much as I so when the door clicked shut behind the last of her classmates I rashly decided we should do it then and there. That's when I pushed her forward over the desk.

I humped quickly, knowing there was very little time left. Mandy responded bracing herself against the desk and pushing her ass back to meet my thrusts. I could feel her thigh muscles tightening on my shaft. "Oh god! Yes!" I gasped. "I'm cumming!" I humped harder still, brutally thrusting my cock up between her pussy and panties as the first shot of cum boiled up my shaft. My semen erupted into her panties instantly soaking the thin fabric.

Suddenly there was a noise at the door and I remembered it wasn't locked! I pushed back away from Mandy and sat heavily in my chair just as the door swung open. Mandy stood up allowing her dress to drop over her half naked ass. I was still cumming, the last few drops of semen oozing down my shaft through the open zipper into my pants.

"Ah! Mr. Adams, there you are." It was Mrs. Harding, the principle. "Am I disturbing you?"

"No, not at all." I smiled trying to keep my voice level and breathe normally. Turning to Mandy I said "Thanks for your help Mandy, you'd better run along to your next class."

"That's okay Mr. Adams, bye!" Mandy picked up her books and walked quickly to the door. "Hello Mrs. Harding." She greeted the principle as they passed. I couldn't help noticing Mandy was walking oddly, keeping her legs together as though desperate to pee. I could only imagine how uncomfortable it was for her wearing wet panties and having cum dribbling down her thighs!

The principle had stopped to watch Mandy depart. I was sure she could tell something was going on. "What can I do for you Mrs. Harding?" I said trying to distract her.

"Is there a problem with Mandy Frazer?" She said with a puzzled expression.

"No... no... she was just helping me tidy up after class." I was praying whatever the principle wanted didn't require me to stand up because my cum smeared dick was still sticking up from my pants!

The principle shrugged and continued forward. "I've noticed you've been staying late after school most nights lately," As she stepped up to my desk I leaned forward placing my elbows on the desk so she couldn't see into my lap. "I was wondering if you would do me a big favor Paul?" she used my first name now that no kids could overhear.

"Yes of course." I breathed a quiet sigh of relief. She seemed to have left the subject of Mandy Frazer alone.

"The sports equipment cupboard is a dreadful mess, can I ask you to sort it out?"

"Certainly Alice, no problem." I lied. "I'll see to it over the next couple of days." Damn! It was hard enough finding time to spend with Mandy as it was without this task being imposed on me.

"Thank you Paul. I appreciate it." She turned to leave as a noisy group of second graders filed in.

The close encounter with the principle had scared me. It must have scared Mandy too as she didn't come back for the rest of that week. It was agonizing! I missed our little trysts and could only hope she did too, enough to come back for more. I continually fantasized about fucking Mandy but didn't know what to do about it. She deserved something better than a quick fuck on her teachers desk! I stopped waiting in the classroom after school for her and got on with the sports equipment cupboard task.

The cupboard was really a large windowless room with double doors adjoining the gymnasium. It really was a mess and took some time to sort out. I hated every minute of it... until I discovered the answer to my problem. Exercise mats! They were six by four foot by two inch thick vinyl covered foam pads. There were ten of them and when neatly stacked made a comfy twenty inch thick mattress. All I needed now was Mandy!

Monday the following week I held Mandy back after class. "Are you okay?" I asked.

"I... I guess so." She looked very tense and worried. "Are we in trouble now?"

"I don't think so." I reassured her. "Mrs. Harding didn't see anything, I'm sure."

"Oh... that's good!" She sighed, visibly relaxing.

"Look... Mandy..." I was searching for the right words. "I'm very sorry for what I did the other day. It was my fault... it should never have happened. It was really stupid of me to force myself on you like that and I apologize for causing you any distress."

"That's okay." She smiled. "It was nice really, I liked it!"

"Oh that's good, but I'll understand if you don't want to do those things again..."

"But I do Mr. Adams, I want to!" She looked worried. "I want to come back tonight but... is it safe?"

"We shouldn't meet here any more, its too risky and we really need to be careful." Mandy nodded gravely. "But I have found somewhere better and much more private we can go." I explained to her about the gymnasium equipment store and made arrangements to meet after school.

The gymnasium was quiet and that was one of the benefits of using it as a meeting place. It was at the back of the school, well away from the throng of kids heading for the school gate. Mandy arrived on time, the sound of her footsteps echoing around the empty hall as she clomped across the polished wood floor. I met her at the storeroom door and ushered her into my windowless lair, taking care to lock the door behind her.

I stood behind her undoing the row of five buttons down the back of her dress. I pushed the garment forward off her arms and let it drop to the floor revealing a matching set of white vest and panties with lace trim. I turned her around to face me and noticed for the first time she had little bumps on her chest pushing up under the soft cotton vest. I slowly pulled the vest up and Mandy lifted her arms allowing me to slip it off over her head.

Her little immature titties weren't much more than swollen nipples standing up firm above her otherwise flat boyish chest. My mouth watered at the thought of suckling those tiny tits but I was in no rush. I knelt to remove her shoes and socks before peeling her panties down. Mandy helpfully stepped out of them. Now she was naked and vulnerable I felt a momentary twinge of guilt that I was about to commit the ultimate sexual abuse on this gorgeous preteen child, but then my desire to fuck her took over and I sat her on the stack of exercise mats.

She watched wide eyed as I undressed. It felt very strange standing naked in front of one of my pupils. I hadn't told her what I was planning but I think she knew where our liaisons would eventually lead. From the expression on her sweet face she had just guessed what all these elaborate arrangements were about.

My stiff shaft hung just inches in front of Mandy's nose. I took both her hands and placed them on my cock and she immediately started stroking me. Although she had seen my equipment before it hadn't been from this close, nor had she had the time to explore. "Mandy, are you sure you're okay with this?"

"Yes... I guess." Her voice was quiet.

"You must be sure?" I insisted. "What we're doing is very wrong, you are far too young!" I placed my hand on her head and stroked her hair.

She took a deep breath then let it out in a long sigh. "I'm sure... I want to do it." Her voice sounded more confident.

I pulled her head forward until her lips touched the tip of my cock. She automatically kissed it, her eyes looking up at me. She knew all about and enjoyed cunnilingus, and I had explained fellatio to her but I hadn't encouraged her to try it before now. "Open your mouth Mandy..." I pulled her head closer and the first two inches of my Dick slipped passed her lips. Her teeth scraping along the sensitive skin felt wonderful. "Oh yes! That's great Mandy." I sighed. "Use your tongue to lick the end... ahh yes... that's really good!"

I could feel the sap rising. I had to resist the urge to fuck her mouth harder and shoot my load down her throat. I needed to save it for her cunt. I allowed her to continue sucking my cock until I couldn't hold on any longer then hastily withdrew at the last moment, just as a small wad of pre-cum escaped leaving a thread of clear oil stretching from her mouth. I had to concentrate to stop myself unloading all over her sweet face.

I climbed onto the stack of mats and pulled the child towards me. Mandy looked so inviting lying on her back. The smooth slit nestling between her half open thighs drew my probing fingers, the little immature buds on her chest begging for the attention of my mouth and tongue. I suckled on one of her preteen breasts, teasing the nipple to a firm point with my tongue. My hand explored the soft skin between her thighs, parting her bald pussy lips as my finger gently probed her virgin cunt, preparing the way for my cock later.

Mandy sighed loudly, wriggling on the mat under my stimulating touch. Her hands held onto my head as I switched my attention back and forth from one nipple to the other. She lifted her ass off the mat grinding her pussy onto my hand. I sensed she was close and slid down the mat kissing her stomach and belly button on the way. For a moment Mandy's fingers held onto my hair trying to pull me back to her breasts until she realized where I was going, then she pushed my head down!

I slid off the end of the stack to kneel between Mandy's open legs. My face fell on her eager pussy and I sucked and licked her delicate nether lips. My tongue probed her tight fuck hole and I made sure there was plenty of saliva to lubricate her for what was to come.

"Arrrgh... yes!" Mandy gasped. The sudden onset of her orgasm surprised me. Her body arched up with the intensity of the moment and her legs clamped tight onto my head. It took several minutes for her to calm down during which I continued to lick her pussy applying more and more saliva.

I quickly climbed back onto the mats and knelt over Mandy. I pressed my aching cock to her mouth once again. "Lick my cock Mandy." I instructed. "Make it all wet with your spit." She ran her tongue repeatedly along my shaft from tip to root spreading her saliva until my Dick shone with her drool. Now I was ready!

I shuffled back to kneel between Mandy's legs which I lifted up until her knees almost touched her chest. My Dick rested on her wet pussy and I slid my stiff shaft up and down her slit, a means of stimulation she had become familiar with. Then I pulled back, aiming my cock head at her cunt and pushing it gently between her labia and into the entrance to her fuck hole.

My movements were slow and gentle, each short thrust advancing just a quarter inch before pulling out. Gradually her tight pussy relaxed allowing more of my cock inside until a little more than four inches of my throbbing cock had been consumed by her preteen cunt.

I fucked the child with short slow strokes, trying to prolong this incredibly wonderful experience. I couldn't hold out for long and soon felt the familiar pre-orgasmic ache. Because of the slow measured strokes it didn't happen suddenly but built up gradually until my cock felt as though it was burning like a red hot poker. The orgasm seemed to last for ages and spread throughout my whole body. Every muscle spasmed in tune with the throbbing ache in my cock. I barely noticed the eruption of cum but the lubrication it provided eased the passage of my thrusting rod into Mandy's preteen cunt.

Finally spent, I rolled onto my back but pulled the girl with me so she lay gasping on my chest, still impaled on my slowly softening cock. I could feel her cunt muscles working and her little body jerked uncontrollably. I realized she had just cum too and held her close as we relaxed in post coital bliss.

I smiled to myself, sated, satisfied and looking forward to lots of illicit preteen sex in the weeks and months to come. That thought alone was all it took for my cock to start stiffening again as I felt it swelling in her cum soaked cunt!

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This was the 4th and final part of the series... I hope you enjoyed it. Thank you for reading.