Disclaimer, this script depicts incest, rape, inbreeding, and brainwashing. The author does not promote these outside of role-play between consenting adults.
In this script, a mother sits down her daughter and explains to her how both her and her mother are going to be breeding slaves for the man of the house, the son. The mother was violated, impregnated, and corrupted months ago and she's decided that it's time for her daughter to join her in servicing her son.
The daughter (unvoiced so the ladies can listen too) is a very smart university student. At first, she is horrified by the things her mother is telling her. Then the extra ingredient her mom put into her tea kicks in and she gets a new perspective.

• Jessica! Could you come down to the kitchen?

• Have a seat I made your favorite tea.

• You're going to need something to drink with this news.

• I saw some on sale and I thought you'd want it. I even added some stuff. It's good right?

• Now I feel like we need to have a talk. Your brother and I are thrilled that you've come back to stay with us while you're on break from university. But we want to explain that things have changed sense you were last here.

• Your brother and I, have had some... developments in our relationship.

• You see, ever sense your father died, I was constantly trying to make up for his loss. First by getting a job as a drug developer, and secondly, by trying my hardest to make sure both of you were disciplined. I've been very strict on both of you for years. I'm pretty sure that's why you wanted to go to college as soon as possible, so you could get away from my constant badgering. Your brother on the other hand, found another way to rebel.

• Your brother explained, in his own way, that he was the man of the house. So he's entitled to certain... privileges. Namely, me.
  I understand the confusion. You see, your brother and I have become.... closer. We have a new understanding of our relationship. It took a while for me to accept it, but when I did, I was so happy. He's stopped being just my son, he's my Master now.

• (Sounds of kissing as the mom and son make out in front of the daughter)

• We have an, unconventional relationship, but it's so rewarding. Even when you put a wrench in it.

• You see, for the last few weeks, we've had a "free use" arrangement. Any time my sweet baby boy needed to unload his balls, he'd simply find me, and start fucking me right then and there.

• After a while, I got so conditioned for it that I was constantly wet and ready for him.

• We had to put that little arrangement on hold when you came back. My poor boy had to wait till you were asleep to use his mommy's holes. And even then he couldn't be as rough as we both wanted.

• I'm afraid we're going to be putting an end to that little break. We aren't going to be hiding our relationship in this house. Anytime your brother needs to use my body, I'll provide it wherever and whenever he wants.

• Whats the matter babygirl? Having trouble keeping your head up?
  That makes sense, I did slip a little muscle relaxer into your tea.

• Don't you worry about it honey, your brother and I will just sit right next to you, so you can lay your head down and won't have to strain yourself to look at us.

• Hmm, I think we'll only have to move one chair, don't you think baby?

• Mommy can just, sit on your lap while we talk.

• Mmm, I think you're going to need a nice, comfortable place to put your cock. Let mommy just lift up her skirt for you.

• Come on, take out your cock right here where your sister can see it easily. Show her the cock that broke her mother.

• Mmm I never get tired of seeing it. I always get a flash of all the times your brother has forced it inside me and I get a little shock of fear and lust.

• Hmm? Oh yes, that's right honey, I said "forced" I wasn't consenting when this started.

• May I please sit on your cock now Master? I won't be able to tell the story without touching myself and I'd like to be somewhere firm when I do.

• Thank you Master, Mommy will be quick I promise.

• Mmmm, it's so good to have him inside me. Right where he belongs.

• Now where was I? Mmm, oh yes, Easter Sunday.

• That's when it started. You weren't there Jessica. I believe when I called you the night before, you told me something about religion being stupid and how you were Bi and proud. And how you were going to have a boyfriend and a girlfriend and I couldn't do anything to stop it.

• (This is just a bit of a comedic aside) I'm still not sure where you got the idea that I hated bisexuals of all people. Just because I didn't understand them back then doesn't mean I hated them. But you did succeed at making your mother cry. Good job.

• (Gently) Don't look away babygirl. Look between mommy's legs. It's okay, I understand why you're bisexual now. A woman's holes can be soooooo... delicious.

• Just look at it sweetie. That's your mother's pussy, wrapped around your brother's cock.

• Mmm, just look at how perfectly we fit together. We were made for eachother.

• Do you like how I shaved my pussy? It was your brother's idea. He said that a clean shave makes a pussy look mouth-watering. He's right, just look at that juicy, bald cunt. Can't you just imagine your lips and tongue gliding along it? I can.

• I can imagine you going back and forth between licking your mother's clit, and sucking your brother's balls.

• mmm ffuuuck. Where... where was I? Oh right, Easter Sunday.

• I was all dressed up and ready to go. I was planning for us to go early so we can help with the Easter Egg Hunt.

• I went to wake up your brother, but when I went to shake him awake like usual he just... grabbed me.

• One minute I'm a normal mother, the next I'm being pinned down and molested by my own son.

• I didn't know what was happening at first. I didn't know what to think, I just froze like a deer in the headlights. My body absentmindedly accepting the pleasure of his touches.
  He didn't say anything. He just groped me and undressed me at first. He tore open my blouse and squeezed my tits so roughly I didn't know how to take it. I'd never been treated this way by anyone.

• When he finally pulled up my dress and tore apart my panties, I snapped to attention.
  It was only then that I realized just how horny I was.

• Mmm, I tried fighting back. But it was worthless. He brought his cock up to my cunt.

• All that fear, adrenaline, and lust swirled around inside me. I knew once he stuck that cock in me, nothing would ever be the same.

• One thrust of his cock inside of me, and I shattered into a million pieces. It only took one thrust of my son's cock to give me the biggest orgasm of my life. Bigger than anything I'd ever had with your father.

• I was so confused by that, I had an image of myself as a good, wholesome, Christian mother. What kind of mother orgasms that hard from being raped by her son?

• Mmm, a mother that hasn't learned her place yet, that's who.

• It didn't end there obviously, I ended up cumming a lot more before he finally exploded inside me. And when that happened, I came so hard I passed out.
  He didn't even stop then. He came inside my unconscious body three more times before he was finally done.

• By the time I woke up, church had come and gone, we even missed the Easter Egg hunt. (Giggle a bit) But I'm pretty sure your brothers sperm went on their own little "egg hunt" inside of Mommy
  Your brother would rape me every day. Every night he would tie me up, shove a plug in my ass and rape my cunt until he fell asleep beside me. Then he would handle his morning wood the same way. And whenever he got horny during the day, he would grab me, pull me somewhere quiet, and use me as quickly as possible.

• Eventually I got used to it. My body craved him. When I knew he was in the house, my cunt would start drooling like Pavlov's dogs, hungry for another meal.

• It wasn't until I knew I was pregnant, that I fully gave myself to him.

• Fffuck, it started with me trying to shame him. Trying to make him feel guilty but when I told him that he'd actually raped a baby into his own mother. It didn't work. He just pulled me upstairs, threw me on the bed and raped my ass.

• He'd never done that before. He'd put plugs in my ass and fingered it a bit, but he'd never actually fucked that hole. No one had. My anal virginity was stolen by my very own son.

• He'd been saving my ass for a special occasion, the day he knew a part of him finally got back inside my womb, tainting it with his seed. The day he marked me as his property.

• I fought as hard as I could, trying to tighten my ass as much as I could, hoping that would stop it. But that only made it hurt more. Eventually, I took the hint and just relaxed my hole. And when I did that, I noticed how good it felt.

• I was so confused by that. I thought sodomy was a sin, and only filthy sluts could possibly feel good from it. A good woman like me couldn't possibly be getting turned on from getting fucked in the ass.

• But I was. Your brother didn't bother touching my cunt at all and it was dripping down my thighs.

• That's when I realized: I'm a whore, a slut, a walking sex toy for my own son to rape and abuse for his pleasure.

• I broke then, I told him that I was his, that I give myself to him fully.

• It was like a little wedding vow, except I love my son more than I ever loved his father.

• Your father was... alright, but he didn't give me what I needed. And what I needed was to be raped and dominated until I understood my place as a submissive sex slave to my master.

• You like that baby boy? You like knowing that you're mommy's Master?

• Mmm, I'm starting to think it should be normal. That every mother should be raped and forced to submit to her son. It's the purest form of love there is.

• Oh, you like when I talk like that master? You like when I say crazy stuff like that?

• Well it's true. Bad mommies like me deserve to be raped and bred as a punishment. Good mommies deserved to get raped and bred as a reward.

• If they're actually good mommies then they should welcome their sons when they're finally strong enough to force themselves back inside of mommy's womb.

• Yes Master I'm a good mommy. I know my place. Mommy is a good little brainwashed fucktoy

• I'll never reject you. If I ever did, it would only be so you could enjoy raping me again.

• That's the only reason mommy exists, to bring you pleasure.

• *At this point let it go to a ramblefap where she begs her son/master to cum inside her pregnant pussy.\*

• My dear sweet daughter, I hope you didn't feel left out while mommy was... reminiscing.

• Oh, I think the drugs are wearing off now. She can actually lift her head now.

• Don't worry, we'll make sure you're happy in our new family. It's not like you'll have any other choice. If you don't help me please your brother, I'm not paying for your college anymore.

• Now get on your knees, and start licking up the mess leaking out around your brother's cock.

• I don't care if you can't walk yet. Crawl on the ground like the bitch you are, and start pleasing both of us.

• There you go. Come on baby girl, mommy's got a treat for you.

• Mmm, You know it's kind of a shame that you didn't come home before that fateful Easter morning. You could have been there to try and stop it.

• You always did look up to when you were young. I know that despite our differences, you would have fought to save me. To stop your dear mommy from being raped.

• Of course, you wouldn't have succeeded. It only would have ended with you being raped too.

• I've known you your whole life. And I know without a doubt, that you would have broken within the first week. You were made to be an abused incest slut.

• We could have been pregnant at the same time. Two, perfectly broken, pregnant, incest slaves.

• But you decided that your own lusts were more important than spending time with family.

• So I've decided that you won't get pregnant, not until you've earned it by showing how dedicated you are to this family.

• Your first job, is to make Master cum inside me again.

• I'm not going to be moving off this cock one bit. If he blows his load, it will be because you made it happen.

• Get licking slut. He's only down to a half chub right now, if he goes limp it'll be your fault.

• *The daughter starts eagerly lapping at both Master's and mom's privates\*

• Hmmm, good girl. You can touch yourself. I know you want to.

• Mmm, there we go. Look at her, eagerly playing with herself as she tries to please us.

• Didn't I do a good job on her?

• Well I didn't put just muscle relaxer in her tea silly. I also gave her a little something extra.

• It makes girls like her so much more horny and suggestible.

• Just look at how quickly she's submitted to us. She should put up more of a fight than that.

• She doesn't even care if she's being drugged right now. It just feels too good for her.

• Mmm, I can feel you getting harder and harder. You like having your sister as a brainwashed sex slave?

• Well I figured that it'd be a great drug to welcome her into our little family.

• Mmm, if she does a good enough job, we can keep her as our little fuckpet. A collared little slave eager to please her owners. Until the day that you decide to put a litter in her.

• Oh, you are throbbing baby, let's do it. We'll keep her as a drugged, incest fuckpet until it's time to breed her. Then we'll make her our empty headed baby factory.

• Mmm. you're doing so good baby girl. Keep sucking his balls, make him cum inside mommy's pussy. Make him defile the hole you both came from.

• *She grinds on his cock as he explodes inside her\*

• Mmm good girl Jesica. I think you'll fit right into our new family dynamic.