Underage Marilyn's Sister Kate Gets Mouthy

by Steven Seven

Copyright© 2017 by Steven Seven

Erotica Sex Story: Kate is a petite, blue-eyed blonde with a pretty face, a tight but shapely ass, and the same milky white skin as both her sisters. In this sequel to "Underage Marilyn Takes It Up the Ass" where the Master enslaved his teen sister-in-law Marilyn, he now enslaves teen sister-in-law Kate. This story is from my serial "Enslaving My Wife and Her Sisters" Ch 3. It's about a college student who gets unlimited wishes from sexy spirit Anastasia. He wishes to enslave his teen sister-in-law Kate.

Caution: This Erotica Sex Story contains strong sexual content, including Ma/Fa   Ma/ft   ft/ft   Fa/ft   Consensual   Mind Control   Slavery   BiSexual   Heterosexual   Incest   Sister   DomSub   MaleDom   Humiliation   Group Sex   Harem   Anal Sex   Analingus   First   Oral Sex   Scatology   Water Sports   Big Breasts   Small Breasts   .


Kate is a petite, blue-eyed blonde with a pretty face and a tight but shapely ass. Kate has the same milky white skin as both her sisters. This story is a shortened excerpt (reduced by about one-third in length) from Chapter 3 of my ongoing serial “Enslaving My Wife and Her Sisters” which is my most-downloaded ongoing story to date. What’s that serial about? It’s about a college student named Steven who finds a book enchanted by a spirit named Anastasia. She offers him a choice: either three wishes, or unlimited wishes. What’s the catch? For unlimited wishes, he must become her consort, and he’ll slowly become a sorcerer. What’s the attraction? All the women and sex and anything he wants. What’s the downside? The more magically powerful he becomes, the less he’ll fit into the mundane world.

This is a shortened adaptation from Chapter 3. To read the complete chapter, go to “Enslaving My Wife and Her Sisters.” This chapter is the sequel to the shortened adaptation of Chapter 2 which is titled “Underage Marilyn Takes It Up the Ass.”

I’m Steve. My big-breasted wife Gloria has two younger sisters who were always hanging around our apartment. Kate was 17 and Marilyn was 14. Kate was a petite, blue-eyed blonde with a pretty face and a tight but shapely ass. Mari, as she was called by the family, was a brown-eyed brunette. Although not as cute as Kate, Marilyn shared the same milky white skin as both her sisters. Plus Mari had a devastatingly big, beautiful, shapely bottom. Little Marilyn’s big ass was by far the most attractive of any of the girls in the family. I wanted to fuck both of my sisters-in-law from the first moment I met them. Now that I had the magic spirit Anastasia on my side, I intended to fuck them both, one at a time. I had a plan. I took the youngest sister Marilyn first. I fucked her in every hole. I brought my wife Gloria (whom I’ve now named Big Tits) into bed with Marilyn (whom I’ve now named Buttfuck) and made the two sisters do each other. Now it’s time for me to take the final sister, Kate. I have a plan.

In my mind, I communicated telepathically with Anastasia, my magical spirit consort. ‘The next order of business is the enslavement of my last remaining sister-in-law. I plan to talk about that over breakfast with Gloria ‘Big Tits’ and Mari ‘Buttfuck’. I want you to advise me as you listen in.’

‘Yes, Master. Of course, Master’ Anastasia replied. ‘I feel you already sending the outlines of your plan directly into my mind. You are a quick learner, Master.’

I returned my attention the two sex-slaves in my bed, my wife Gloria and her 14-year-old sister Marilyn. “That was good sex, bitches” I said. “I enjoyed your bodily service to me. Your mouths, tits, asses, and cunts are delightful. You are serving your Master well. I’m glad I own you. Now let’s have some breakfast. But first we’ll take a shower. Over breakfast I want to talk to you about my plan for enslaving Kate. Once I have her, I’ll be the Owner of all three sisters.”

Gloria and Mari gratefully acknowledged my praise for their skillful sexual service to their Owner. I kissed each of them before they climbed out of bed.

Just as we had done yesterday, the two naked sisters and I walked to the bathroom. They knelt in the bathtub, put their faces cheek to cheek facing me, and opened their mouths. I began pissing into their eagerly waiting mouths. I filled one slave’s mouth before turning to the other. I allowed each one to gulp down her Master’s urine while I filled the other slave’s mouth with my golden waste water.

After the final drops of my urine had dribbled into the last lucky girl’s mouth, I said “Good bitches. Now what do you say, whores?”

“Thank you, Master” they said in perfect unison.

I reached over turned on the water control. While the water was heating up, I said “Big Tits, blow me. Buttfuck, lick my asshole.” Each sister thanked me for commanding her, and then went to work on their assigned task. Gloria sucked skillfully, soon taking my cock into her throat. Mari spread my hairy butt cheeks then began tonguing my anus. Soon enough, the tip of the teenager’s tongue was in my asshole.

When the water was warm enough, I commanded my slaves to stop their oral service to their Owner. Then I switched the water flow control to the shower. Handing each sister a wash cloth and a bar of soap, I commanded them to wash me. Again, they thanked me for commanding them, and then set swiftly to work. It seemed like no time at all before they had lathered me and washed me from head to toe. While the girls went about their work, I continually fondled their breasts, fingered their buttholes, and their cunts. I kissed them and they returned my kisses enthusiastically. After I was clean, I commanded them to clean themselves while I continued to fondle and finger them at will.

When the shower was done, we dried off. My slaves put on robes. I did the same. Then we went to the kitchen. Gloria began to prepare coffee while Mari put breakfast foods and dishes on the table.

As we sat at the table having our breakfast, I began to outline my plan for fucking and enslaving 17-year-old Kate. “First of all, bitches” I said “let’s acknowledge that Kate is a bitch in the classic sense of the word. She’s cute blonde with blue eyes and has always taken advantage of that. She’s stuck up and proud. She has a prickly personality. She can be charming when she wants to be. But most of the time, she’s just an arrogant little bitch.” I paused and smiled. “So when I take the little cunt, I aim to bring her down a peg or two ... before I debase her all the way into the basement and below. I am going to degrade and humiliate Kate until she feels lower than shit. In fact, I am going to make her understand that she is nothing but a piece of sex meat who is lower than shit in my harem. Kate is going to be my lowest slave. Lower than either of your two whores. The degradation of Kate is my project for today. And for every day after that. You two cunts will help me to achieve that. Understand me, whores?”

Gloria and Marilyn smiled and nodded their heads as they spoke over one another in their eagerness to agree with their Owner. “Yes, Master! She deserves it” Gloria said. At the same time, Marilyn said “I’ll help you treat her like shit!” The two cunts babbled on and one for nearly a minute. I nodded my head and smiled at their eagerness to exact revenge on their prettiest sister. They are happy to help me degrade and sexually abuse Kate. We were in for a happy, happy day!

Then I stopped suddenly. I said “Why am I sitting here with you two bitches having your robes closed? Open them up. I want to see your tits while I’m talking to you.”

Gloria and Mari immediately opened their robes. Gloria’s massive 42-inch E-cup tits greeted me in all their glory. Mari’s small, saucer-shaped tits with their pink, puffy-nipples seemed to wink at me. I felt better just having all of my tit property in plain sight.

“That’s better, bitches” I said. “Now Big Tits, you will be away from the apartment when Kate comes over today. I already know that she wants to come over to see what’s been going on here. She wonders why Mari spent the night.” Turning to my youngest sex slave, I said “As for you Buttfuck, you’ll also be away, but you’ll return sooner than Big Tits.”

“Master” said Mari “how do you know that Kate will be coming over?”

I smiled and reached out towards the teenager’s chest. Taking one of her puffy nipples between my fingers, I fondled and twisted it lovingly. “That’s easy, bitch” I said. “I have the power to read minds. I know that Kate has fallen in love with me, just as you did. My magical slave Anastasia has been setting Kate straight about what she should want and do. Kate doesn’t know that this is what’s going on. She simply thinks she feels what she feels on her own. It doesn’t matter. I’m going to fuck the bitch and enslave her just like I did with you and your sister.”

Mari grinned and nodded her head.

I turned to Gloria. “Isn’t that right, Big Tits?” I asked as I reached out and grabbed one of her massive tits with my open palm, then closed my fingers on the tit flesh, squeezing it.

Gloria smiled and sighed with pleasure. If I had done this even a week ago, she would have been pissed. Now she’s delighted. “Yes, Master” said my big-breasted slave.

We had finished eating out breakfast. I commanded my slaves to clear the table and wash the dishes. I went back to the bedroom to dress. When I returned to the kitchen, I saw Gloria and Marilyn putting away the last of the cleaned breakfast ware. Both of their robes were still hanging open. Their breasts and cunts were delightfully visible. I admired Gloria’s massive rack of tits and her light brown pubic hair. Although Mari’s tits were small, her puffy nipples were very cute. Her pubic hair was a shade darker brown than her older sister’s.

“Now you two whores dress and go out for a while. I’ll send you mental commands when you should come back. Mari will return first, then Gloria. You’ll find me in bed with Kate. And speaking of Kate, the bitch is taking a shower right now. She’ll be over here before too long. So you cunts had better skedaddle!”

Gloria and Mari smiled at me. “Yes, Master” they said in unison. Then they went to the bedroom and dressed.

I heard a bell inside my head. Anastasia said ‘Master’ Anastasia said. ‘I have prepared Kate according to your instructions. Last night in bed she realized for the first time that she has been secretly in love with you all along. She masturbated thinking of you. She’s hoping you will seduce her when she arrives here today. If you don’t, she is planning to seduce you.’

Gloria and Mari emerged from the bedroom, all dressed and ready to go. “We’re off to the mall” said Mari. “If we see any pretty girls, we’ll take pictures of them for you, Master.”

Gloria said “When we each get back, we’ll be ready to strip and serve you immediately, Master.”

“Good whores” I said before embracing and kissing each of my slaves. Then with a firm swat on each of their bottoms, I sent them off.

I grabbed a book of short stories from the living room bookshelf and sat down to read. Suddenly, Anastasia materialized on the couch next to me. She was as naked as she had been in the dream. Her alabaster skin and flaming red hair were as striking as the beauty of her face and her sparkling green eyes.

I was startled to see her in the flesh. I reached out and touched her. Anastasia was a solid and warm as my wife-slave and sister-in-law slave had been. “I didn’t know you could materialize” I said.

“Only for short periods of time” Anastasia replied. “It takes a lot of energy to do this. I wanted to surprise you!”

“Well, you sure did that!” I replied before leaning over to kiss her and fondle her ample breasts.

“Could I give you a quick suck before I have to go?” Anastasia asked with a wink.

“Sure, slave” I replied as I opened my zipper.

The magical redhead leaned down and swiftly took my limp penis into her mouth and began sucking it. Her technique was incredible! Her tongue and lips and mouth and throat worked in a coordinated fashion that seemed like a fellatio concert. I rested one hand on her red hair and reached under her chest with the other, grabbing a breast and squeezing it.

I just there was a knock on the door. I knew it was Kate. Anastasia came up from my crotch, kissed me on the lips, then said “I want more of that later, Master. Please?”

I kissed her lips, then said “Absolutely, bitch! Now go!”

With a wink, Anastasia disappeared into thin air.

Kate knocked again. “Coming!” I said as I stuffed my cock back into my pants. That was not an easy thing to do, since Anastasia had given me a strong erection. In fact, ‘coming’ was something I could have done in Anastasia’s mouth with just a few minutes more ministrations from my magical redhead slave.

I stood up from the couch awkwardly and moved somewhat slowly towards the door, trying to give my erection time to subside. When I finally opened the door, I did a double-take when I saw Kate. The petite blonde 17-year-old usually wore sedate clothing, like jeans and loose shirts, or somewhat preppy attire that revealed little of her figure. Not today. Kate was dressed like a firecracker about to explode: skin-tight red shorts and a white halter top with blue trim along the neckline and arm-holes. Her long blonde hair was braided into a pair of pigtails, with one in front of her chest, and the other behind her back.

Kate must have noticed my expression of surprise, because she smiled coquettishly before saying “Aren’t you going to invite me in?”

“Of course” I said. Then, rather impetuously, as soon as she had stepped inside and I had closed the door behind her, I gave my teenaged sister-in-law a hug. Now it was Kate’s turn to be surprised. I could feel her body move quickly from stiff surprise, to tingling excitement, and then loose and easy receptivity. I said “We really should hug more, don’t you think? We’re family after all.”

“Yes! Yes, we should” Kate said as she hugged me back, pressing her blonde head against my chest.

We hugged tightly. Petite Kate was a full head shorter than I am. I looked down at her golden blonde hair. Then I began swaying, tugging the teen along as if we were dancing in place. I heard as well as felt Kate give a deep sigh.

I spoke in a soft but deep male voice. “I always felt there was something special between us, Kate.”

I could feel her heart beat more rapidly against my chest. “I do, too” she said.

“You know” I began slowly “since I married your sister, in some sense I married you too. Don’t you think?”

I was feeding her the same bogus line of bullshit I had fed her younger sister Marilyn, who had taken the bait and swallowed it hook, line, and sinker. Would Kate do the same?

The young blonde looked up at me. She was so beautiful; the most beautiful of the three sisters by far. She gazed up at me, blue eyes wide open, pupils dilated. Her lips were parted slightly. “That’s true! It’s so true, Steve! I can be like another wife to you. Can’t I?”

As I leaned down to kiss her, Kate rose up on her toes to meet my lips with hers. We kissed deeply, passionately. We let our hands rove over one another’s bodies.

I pulled back from the kiss and said “Kate, have you ever had sex before?”

She shook her head. “No, Steve. I’m a virgin. I want to lose my virginity to you.”

I smiled. “That’s good, Kate. I want to be your first. And your only. Gloria is my wife and I own her exclusively. Just like a slave is owned by her Master. In fact, Gloria is my slave. I am her Master. Do you want to be my slave, Kate?”

I thought the teenager might be startled to hear this. But she simply nodded her head, as if sexual slavery was the most natural thing in the world. “Yes, Steve. I want to be your slave. Just like Gloria. I want you to be my Master.” Kate got a wicked smile on her face. She bit her lower lip. “Please command me, Master” she whispered.

I put my hands on her halter top, on top of her breasts. “Uncover these, slave” I said.

“Yes, Master” my pretty teen blonde said. Kate untied her white halter top, uncovering her white lacey bra. Reaching behind her back, she undid the bra. Then she pulled off the halter top and the bra at the same time. Her breasts were only a little larger than her younger sister Marilyn’s, but Kate’s nipples were more like her older sister Gloria’s. Kate’s lovely white breasts were topped with ample pink areolae and nipples.

I reached out with both hands, placing my palms flat against Kate’s nipples, and cupping her young breasts. She smiled at me as I did this. We kissed again. “Take off the rest of your clothes” I commanded.

“Yes, Master” my newest slave replied.

Kate swiftly removed her shorts and panties as well as her shoes. The petite blonde stood naked before me for the first time. Her bright blue eyes gazed at me with loving submissiveness as she waited for my next command. I looked her up and down. Kate was small but shapely. Her breasts were perky. Her waist was slim. Blonde pubic hair sat above her virgin cunt. I gestured with my hand in a circling motion, which she correctly interpreted as a command to turn around. Kate’s buttocks were not as large as her younger sister Marilyn’s fantastic bubble-butt, but they were equally white and beautifully formed. Kate’s butt was heart-shaped.

“Bend over the spread your butt cheeks, Kate” I commanded.

“Yes, Master” she replied as she bent forward, reached backward, and used her hands to spread her buttocks, revealing her anus for the first time.

I knelt down to inspect Kate’s ass. Her anus was small, pink, and tight. I moved in close enough that I could count every fold of skin that extended outward from her anal star. Without bothering about lubrication, I gently pressed the middle finger of my left hand against her anus. “Slave Kate” I said “I want you always to remember this. The first time you were penetrated in a sexual manner was me shoving a finger up your ass.” Then, without further ado, I pushed my finger into the 17-year-old’s asshole. I moved slowly but relentlessly. I didn’t stop to let her adjust to the feeling. I kept on moving my finger deeper and deeper into the teenaged virgin’s asshole until my finger was buried deep inside her rectum.

“Kate, for the rest of this day, much of the time I may choose not call you by your old name anymore. ‘Kate’ is your old name. It’s dead. I am going to call you by a variety of new names. Bitch. Whore. Cunt. All sorts of lovely names. Names suitable for a slave. You still want to be my slave, don’t you, bitch?”

“Yes, Master!” she replied. “Yes! Please call me any dirty names you want to. I am only a slave. You are my Master. You can do anything you want. Say anything you want. Please, oh please, just allow me to serve you, Master. Use me for your pleasure. Your slightest wish is my command.”

“Good whore” I said. Kate was speaking the same words that Gloria and Marilyn had also used. I was certain that Anastasia had planted those thoughts in each bitch’s head. She knew that these were exactly and precisely the words I wanted to hear from my slaves. That’s how I want my slaves to think and speak. And act. Now was the time for action.

I pulled my finger out of Kate’s asshole. I had to sniff it, just to learn how Kate’s odor differed from Gloria’s and Marilyn’s. Having satisfied my curiosity, I stood up while commanding Kate to do the same. I made her turn around and face me. Then I held my dirty finger up to her nose.

“Smell this, bitch. This is the finger I shoved up your ass” I said.

Kate’s pretty face contorted with revulsion as she sniffed my finger. A look of disgust crossed her face.

“Suck it clean, whore” I said.

Kate opened her mouth. She gazed at me, her deep blue eyes pleading for mercy. I gave the blonde teenager a firm look of unbending intent. She stuck her tongue out and began to lick my finger. The taste seemed to surprise her. It was not as bad as she had expected. Then I reached behind her head with my other hand. With one hand on her head and the other finger in her mouth, I pushed from both ends, forcing my finger so far into her mouth that it hit the back of her throat, triggering her gag reflex.

“Don’t you dare back away, bitch” I said. “Take your Owner’s finger down your throat. Show what a good whore you can be.”

My pretty blonde sister-in-law continued to gag, but did not resist my finger. Her blue eyes watered. I smiled. “Always remember this, whore-Kate: your second sexual initiation was to have the finger that penetrated your ass shoved down your throat. From anal to oral. What a lucky girl you are! Don’t you think, whore?”

I pulled my finger out of the teenager’s mouth so she could answer. Kate coughed and drooled. The tears that had welled up while I was gagging her with my finger had streaked her pretty face.

“Yes, Master” my newly submissive 17-year-old sister-in-law said. “I feel like the luckiest girl in the world.”

I smiled. “Good whore” I said. Then I put my face against her chest. I licked her sweet pink nipples, which together with her areolas were fairly wide and large. I sucked the nipple of one little tit and then the other. Kate stroked my hair while I sucked her tits. She purred with pleasure. Then I bit down hard on one tit.

“Ow!” she said. “Thank you, Master. Thank you for abusing my tit for your pleasure.”

I bit down hard on the other tit. Then I said “Are you ready to suck my cock now, bitch?”

Kate smiled. Her pretty blue eyes glistened from her recent tears. “Yes, Master!” she replied. “I can’t wait to have your cock in my mouth!”

I stood up, undid my pants, and dropped them to the floor. I was not wearing any underwear. Why bother when I had been planning on exactly this event? I pulled my shirt off over my head.

Kate dropped to her knees and took my cock into her mouth. She gazed up at my face. Her expression showed a combination of deep submissiveness with an erotic charge that was surprising in a girl who had been a complete virgin just a few minutes earlier. All I could think was the Anastasia had done an amazing job preparing virginal Kate’s mind and heart for her servitude as my sex slave.

“Ok bitch” I said. “I want you to understand one thing clearly. I am going to fuck your mouth, your pretty face. I am going to be so brutal that it’ll be like rape. Now I want you to beg for that. Beg me to rape your mouth. To brutally fuck your face. Your throat. Beg me to treat you like trash. Beg for it, bitch.” I pulled my cock from Kate’s mouth so she could speak clearly.

“Please rape my mouth, Master” the blonde teenager said. “Please be brutal. I’m begging for it, Master. Fuck my mouth. Fuck my throat. Fuck my face. Be brutal. Abuse me, Master. Treat me like a piece of trash. I only live to serve you, Master.”

“Good bitch” I replied. Then I put my cock back into the young girl’s mouth. I grabbed one of her blonde pigtails in each hand. She looked me in the eye while I did this. I spat on her face. “You’ll wipe my spit off later and lick your fingers to eat my spit. But for now, just prepare to have your mouth raped, little bitch. I am going to throat-fuck the living daylights out of you, little whore. Always remember this: Your first sex experience was to have your Master shove a finger up your ass. Your second sex experience was to have your Master put that shitty finger in your mouth and make you suck it clean. Now your third sex act is to suck your Master’s cock and then have him brutally fuck your mouth and throat with it. Oral sex is going to be your specialty from now on. For the rest of your life, bitch. Because you’re so pretty. I’ll fuck your mouth over and over and over.”

With Kate’s blonde pigtails in my hands, I pulled her head closer and closer to my crotch, forcing my cock into her mouth and then into her throat. She coughed, gagged, and choked. But she did not resist. I released my grip a little, allowing my cock to pull back from her throat into her mouth. The teenager immediately began licking it. Then I pulled her head close again, sending my cock back into her throat. The little whore was clearly struggling with this massive invasion of her formerly virginal throat. Releasing again, I let the little bitch breathe. Then I invaded her throat again. Each time my cock retreated from her throat into her mouth, thick spittle and gastric fluids drooled from her mouth. I repeated this cycle over and over for a couple of minutes, feeling the great joy that comes from getting oral sex from a beautiful teenaged blonde girl who is completely at my mercy.

I released Kate’s pigtails from my hands. The easy part was over for my newest slave. Now was time to step up the oral abuse to a new level. Placing one hand behind her head and the other on her throat, I began to face-fuck the helpless teenager with rapid, deep thrusts. I put my hand on her throat. With every thrust of my cock, I felt her throat bulge. Every time my cock entered Kate’s throat, it sent a pulse down the bitch’s throat which I could see and feel from the outside. I was practically masturbating with the girl’s mouth and throat, except for the fact that she cooperated in her own oral abuse and debasement. Each time my cock retreated from her throat into her mouth, the girl used her tongue to pleasure me further. Kate’s tongue washed the underside of my cock just under the head, where my penis was most sensitive. I was certain that Anastasia had programmed her to do this. How else could a virgin teenager have learned it?

I happily throat-fucked my 17-year-old sex slave for several minutes. I could easily have come in her mouth. But I wanted to save that pleasure for later. Right now, I decided to give my young slave her first orgasm that did not come from masturbation. Using my magical powers and my powerful cock, I raised Kate’s sexual arousal higher and higher, until with a mere thought and one, last, deep thrust of my cock down her throat, I brought the little bitch to orgasm.

Kate’s body shivered and shook with joy as I wracked her with a wave of orgasms that she will always associate with sucking my cock. The young cunt is now my oral slave. From this moment on, and for the rest of her life, Kate will crave sucking my cock more than anything. The face-fucking abuse I inflicted on her will be forevermore her idea of foreplay. The deepthroating I forced upon her will be Kate’s idea of deep sex.

Now that Kate associates coming with my cock, I withdrew my penis from the girl’s mouth. Spittle drooled down from the teenager’s mouth in long, thick gobs. Her eyes were watery with the tears of joy that well up for all of my slaves when I abuse their mouths like this. The gob of spit I had spewed onto her face still decorated the pretty blonde.

Kate raised her blue eyes to look me in the face. She coughed. Then she wiped spittle from her mouth. “Thank you, Master” she said. “Sucking your heavenly cock was the most wonderful thing that’s ever happened to me! I hoped that I would make you come in my mouth. Did I do a bad job, Master? I tried to help you rape my mouth and throat. I wanted to give you pleasure.”

“Yes, you did a good job little whore” I said. “It was so good that I could have come in your mouth. But I’m saving that for later. I want to fuck your other holes first. Before that, wipe my spit off your face and swallow it. That’s a good girl. Now let’s go into the bedroom.”

I offered her my hand to help her up. Kate stood and then I hugged her, kissing the little teen atop her blonde head. “You’re a good mouth-fuck, Kate. Come with me so I can fuck your cunt next.”

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