Author's Note: This story is based on a suggestion from a reader. I have to apologise about long it took to write, things got very busy at home. As soon as my master discovered I'd not published it yet he set about finding ways to motivate me... Suffice it to say that we've discovered forty-five minutes of orgasm denial (until I'd finished the story) is a great inspiration!

"You're a fucking liar!" She screamed. I ducked, narrowly avoiding the plate which disintegrated inches above my head and the brown slime of the spaghetti bolognese which now decorated the wall.

"I'm not!" I insisted "I may have looked at her, perhaps twice when she first hooked up with Ian but since they became serious? Since I met you? Never!"

The topic of conversation was Michelle, my sister in law who was married to my twin brother Ian. No matter how many times I denied it, no matter how many times I reassured Louise that I only had eyes for her the accusations continued to come.

The truth was Michelle was hot, if truth be told she was stunning. She had long dark hair and big brown eyes which turned men week at the knees. Her breasts made themselves known beneath even the most unflattering tops and her ass was something remarkable to behold. That was irrelevant however, she was family and somehow I sensed explaining this to my girlfriend would to little to alleviate the issue. I thought of her now as a little sister, she was certainly not on my "want to fuck list".

"Are you sure?" Louise asked, a cup of make-up tea in her hand.

I blinked, confused by the sudden transformation of a dinner hurling banshee into the tea making girlfriend.

"Yes!" I confirmed (for the eighth time).

I took the tea, sipped it and passed out.

When I woke up I wasn't at home. I looked around me, trying to get my bearings. I was in a bedroom, but not my bedroom... and I was stuck!

"It's a good job they left you a spare key!" Louise commented, more to herself than to me "Are you comfortable?"

I stretched. I was lying on my back on the bed, I'd been stripped naked and my arms and legs were chained tightly to the bedposts.

"Not really, no!" I exclaimed. Wondering what had possessed this madwoman to hold me prisoner in someone else bedroom.

"I don't really give a fuck..." She replied.

In one swift movement my girlfriend was on top of me, holding my nose so I was powerless to resist she forced something between my teeth. The texture of silk and lace filled my mouth as she crammed a second and then final pair of panties between my teeth. Strong duct tape held the gag in place, she held my hair firmly as she wound it around my face speaking my lips shut and silencing all forms of protest.

"Whaa he 'uck ahh ooo oing?" I managed to gasp around the gag.

Louise held her hand to her ear in mock deafness "I'm sorry?" She grinned wickedly "I can't understand you?"

From her handbag she produced an envelope, sitting on the edge of the bed she took great delight in reading the letter aloud.

"Michelle..." She began "Mistress... Please forgive me for taking this liberty but I have been selfish and I desperately need to serve you. Mistress, please tease me for your amusement, please use my cock as your plaything and if it pleases you please then use me as your fuck toy. I am here merely to pleasure you, my body is yours and I know no other mistress." Louise paused before reading the signature "Ian..."

Carefully she rose to her feet, placed the letter in the envelope and propped it up on the bedside table behind me.

"In case you haven't worked it out yet..." She added "It's over! Have a great night..." She added sarcastically.

For a moment I lay there alone, then I began to tug furiously at the restraints which held me. I screamed into the gag but only muffled noises escaped my lips. It was no use, I was stuck. My only chance was to attract Michelle's attention before she read the note, otherwise I'd be fucked... literally!

I don't know how long I waited, if there was an alarm clock in the room it was outside my field of vision. I could only wait and hope against hope that Michelle wouldn't take the note at face value, that she'd let me explain and not ask why I was gagged with three pairs of her panties, or perhaps that she'd be able to tell the difference between me and her husband. It was while thoughts of panicked explanations filled my mind that I heard the door open.

There were footsteps on the staircase and the sound of shoes being kicked aside. A handbag was thrown to the floor and before I knew it I was staring into the young woman's surprised eyes.

"Well!" She exclaimed "My day just got a lot better!"

"Ishell..." I cried out behind my gag "'im oh eeean."

"Shhh..." She ignored me, picking up the note. I saw to my horror that it had been typed and printed, not even the handwriting would betray me!

"You want me to tease you?" She smiled, I shook my head violently from side to side "You want me to use you as my fuck toy?" I thrashed my head from side to side but she continued to ignore my protestations.

Throwing her suit jacket to one side the young woman set about unbuttoning her blouse. Her white lace bra showed beneath the cotton as she worked, the delicate undergarment supporting and containing her breasts against all odds. With her shirt discarded the brunette set about her skirt, her nimble fingers quickly unbuttoned the waist and pulled down the zipper to reveal a matching pair of panties.

I couldn't look away as she unhooked her bra, freeing her breasts and inspiring my cock to stiffen. She threw her panties aside and climbed onto the bed, one leg either side of my knee. Her breasts moving as she drew breath.

I let out a groan as her cool hands stroked my cock, I twisted forcefully trying to escape her touch but it was no use. The young woman seated herself on one of my thighs as all my struggles achieved was to cause her boobs to bounce as she rode me like a wild animal. This did nothing to still my erection which throbbed with all the vigour of a chained beast.

"You can squirm all you like!" She teased "I'm still going to fuck you!" She boasted.

I cried out, trying to warn her that all was not as it seemed but the gag muffled my warnings. I bucked my hips, trying to throw her off but all I achieved was another wonderful bounce of her chest.

Michelle caressed my cock with her fingertips, I twitched beneath her touch and I saw my cock glisten with the first traces of precum. I could only watch in horror as she shifted her weight down my legs and lowered her lips over my erection. Pinned in place there was nothing I could do but groan into the gag as her tongue explored the length of my cock.

"You taste different tonight..." She smiled, I met her eyes. Pleading as she resumed her task but there was stopping her. She sucked me with an enthusiasm never displayed by the crazed bitch who had left me in this position. Whatever madness had driven her actions Louise had finally given me that perfect I'd craved. I imagined the thought would drive her into a frenzy, that her own act of revenge had resulted in my receiving the best oral sex of my life!

Michelle's movement brought me back to the present. Apparently satisfied that I was ready for her my sister-in-law climbed up my body. Carefully she took her position, angling my erection so I'd slide straight into her.

I shifted my position in a final attempt to avoid the inevitable, I knew my efforts were futile. I rolled my hips away but the brunette grabbed my cock and slid herself onto me.

I cried I to the gag as I felt Michelle's weight on me. Her eyes widened as she felt the full length of my erection inside her. Slowly she began to move, rocking back and forth to stimulate herself on my throbbing erection.

I tried to push her off, to raise my hips but all I succeeded in doing was impaling her on my cock. Something the young woman saw more as a highlight than an escape attempt.

I felt Michelle's body tense as she came, she tightened around me as the climax overtook her. She closed her eyes and continued to ride me, her pace only slightly diminished by her first orgasm. Her breasts shone with sweat and her face glowed red, her eyes locked with mine and I saw with horror that this was a woman who would not be sated with a single climax.

"My my..." She whispered "you are being stubborn today!" She teased. Apparently inspired by her own orgasm she decided it was time for me to receive my own reward. Redoubling her efforts she set out to push me over the edge.

My mind was gone, my resistance had failed. Michelle fucked me as she wished and I had no will left to resist. I watched hypnotised as her breasts bounced, each time her chest moved up and down I felt a new wave of pleasure wash over me.

Michelle came a second time, she cried out and dug her fingers into my chest.

"Cum with me..." She begged.

I couldn't, I wouldn't...

Clambering off me she knelt beside me on the bed. I was in her hands, and they were very experienced!

I tensed as she coaxed me to orgasm. Tied and gagged there was little I could do to resist, I cried out a muffled groan as my cock erupted. Warm sticky cum flowed freely over her hands, covering her rings and dripping onto my leg.

"There you go!" She smiled smugly, obviously pleased that she'd brought me to orgasm despite my best efforts to resist her.

Michelle moved to the bottom of the bed, her hands on the padlock which held my ankle. She was clearly about to release me, my time was running out. My stomach turned, I envisaged the conversation to come. Forced to admit the mistake, unable to hide the delight I'd experienced at being fucked by my sister-in-law. At least we'd be alone, I don't think I could bear confessing to Ian at the same time.

It was at that moment I heard the front door open, my brother was home...