Alright so i took a couple of your comments into consideration and cut this scene into paragraphs for easier reading. I also cut down on the constant references to mother and son. i hope you like and let me know.

The Nymphamily fourth scene

The oldest son Bobby shows up at the house with his fiance Sara for the first time and introduces her to his Mother. Her name in the skit is Mother or Mrs. Anderson. "How are you my dear, nice to finally meet you." Says Mother, shaking Sara's hand as she looks at her with slight disgust. "Nice to meet you too, I've heard so much about you." "Really? Not too much I hope ha ha." Responds Mother as she looks at Bobby as if too say, "you better not have told her anything!" They are out on the deck by the pool enjoying the weather. "It's so lovely out, I was swimming laps earlier. It's too nice of a day to spend it indide. Don't you think?" Asks Mother. "Oh yes it's wonderful out here Ma'am." "Oh Sara you don't have to call me Ma'am, you can call me Mom or Mrs. Anderson. Whatever you like." Adds Mother as takes off her shirt leaving just her bathing suit top on up top and her tits bulging out. Sara, quite shocked by her beauty and her heaving tits says, "my Mrs Anderson, you're very beautiful." "Aww, thank you my dear, you're pretty too Sweety. Like that flower over there behind you." Responds Mother pointing behind Sara. Sara then turns around and as she does Mother looks at Bobby and starts smiling while sticking her finger down her throat. She is definitely not the best looking girl on the block, which leads Mother to wondering why Bobby is with her in the first place. Mother decides to play this to her full advantage and keeps showing more cleavage and leg to Bobby and moving closer to Bobby while she asks questions and gets down to the bottom of it. "So what are you studying at school Sara?" Aks Mother. "Education, I wanna be a teacher." "And so what do your parents do?" Asks Mother as she moves over to the chair next to Bobby and puts her arm around him, while pretty much resting her tits on his arm. "Well, my Mom's passed," "I'm so sorry sweety!" Interrupts Mother as she leans her tits across Bobby to grab Sara's hand. Bobby's dumbfounded by this and can't move. "Don't even tell me your Father's gone also, I'll feel like a total bitch!" "No, no." Answers Sara, "my Dad lives up in Terrace Hills and is a radiologist." "Wow, I bet he makes good money. And Terrace Hills, I'd say he's got a nice house." "Yeah, he actually is wanting to move out because he says it's too big, and when he does he's gonna give it to me." "Bingo!" Mother thinks to herself, "that's gotta be it!". "Well that's nice, that'll be alot of fun!" "Ya, I can't wait!" Says Sara grabbing Bobby's hand snapping him out of staring at tits. "Yea alotta fun." Says Bobby, looking at Sara, then back at Mother's tits. "What's wrong with you, you're normally more talkative?" Sara asks Bobby. "Nothing, just day-dreaming I guess." Says Bobby still staring. "Bobby! What are you doing?" Pleads Sara. "Nothing Baby, why don't you talk to my Mom for a while," Bobby answers.
But Mother's not helping either. She keeps pushing her tits closer to Bobby's face for Bobby to notice. It's almost as if Mother is getting off from Sara's jealousy. And Sara is noticeably jealous. Everytime Mother moves closer to Bobby or pushes out her cleavage, Sara sighs loudly, as if it isn't fair. But Mother's jealous of her Son's new engagement and notices that he's looking at her tits and pushes even harder to get all of his attention. "Sweetheart, do you think you can help me with this sun-tan lotion?" Practically ripping his hand out of Sara's hand. Bobby responds, "sure! Where do you want it?" "Everywhere Baby." Says Mother touching her front side as she sits back and closes her eyes. "Ill be laying on my back, so I'll only need it on my front. My legs and arms are so sore from swimming earlier, I just can't lift them. And I don't want my breasts to burn. You don't want my Breasts to burn do you Baby?" She asks looking at him intently. "No, no I don't." "Well help your Momma out and put some lotion on these titties for me Sweetheart." "Are you serious, you're really gonna put lotion on your Mother's breasts?!" Interrupts Sara. "What?" Asks Bobby, "what's the problem, my Mother's sore and I'm helping her?" "Yes Dear, what's the problem?" Asks Mother as she pulls her tits out of her bathing suit top. "Uuuuggghh, what do you think the problem is? Your practically naked in front of your grown son and acting like it's no big deal!" "Aww Sara, if you'd like Baby, you can get naked too and join in." Proposes Mother as she reaches out and carresses Sara's leg. "No!" Yells Sara as she slaps away Mother's hand. "You're sick Mrs Anderson! Come on Bobby let's go!" Bobby stuck in the middle of choosing between his gorgeous Mother or his broke rich Girlfriend doesn't know what to do and freezes. "Sweetheart," he says, "let's just stay for like 15 more minutes and then we'll leave." Sara, obviously already in love with Bobby, gives in and sits back down, lets out a loud sigh and says, "whatever, you promise Bobby, right after you put the lotion on for your Mom we're leaving?" "Okay Baby," says Bobby as he leans over and kisses her, "you're the best."
As he goes back to Mother with his back turned to Sara he wipes his lips on his sleeve. Mother sees this and starts laughing out loud. "What's so funny?" Asks Sara. "Nothing." Answer Bobby and Mother in unison, and then both of them start laughing again. "Here you go Baby," says Mother, handing Bobby the lotion. Reclining back in her seat, as she looks right at Sara, she gives Sara a look and a smile as if to say, "I got my way and you didn't." Bobby pours the lotion all over Mother's front and throws the bottle to Sara to hold. Wasting no more time Bobby starts rubbing the lotion in. Getting her arms early and her stomach Bobby moves onto her breasts. When he does Mother lets out a loud sigh, then moans and breathes in deeply, popping her tits out. Bobby now mainly focused on Mother's tits, rubs in the lotion deeply. Grabbing her sides and running his hands and fingers up her ribs and then to her tits he squeezes them together. "Is that really nessecary, I mean," "what?" Interupts Bobby as Sara was about to complain. "I'm just being thorough Baby." "He knows what he's doing Sara." Doubles Mother. "Yeah I'm sure he does. Too bad I wouldn't know." Says Sara sarcastically, getting more and more upset. "Oooohh that's too bad Sara. He has some magical fingers!" "Baby don't get mad okay." Says Bobby, looking at Sara. "Okay Bobby, it's just gonna take some getting use to for me." "Good Baby, because, well don't get mad okay? I'm gonna take my pants off now and let Mom put some of this strained muscle ointment on my inner thigh."
"What!? You're gonna do what?" "You remember Baby, that lotion stuff that you hate the smell of? Well I hurt my thigh the other day playing basketball and I need to put this on every 4 hours or it hurts." "Oh Baby, did you hurt your thigh again," says Mother, sitting up in her seat. "I'll make it feel better. Just like always." As she again looks at Sara, rubbing it in. Mother reaches down and starts carressing his inner thigh and says, "you just tell Momma where it hurts and I'll make it feel all better," as she is now staring at Sara, as if to say, "I'll take care of him, and you won't." "Here Baby, you take my seat and sit down. Let's get rid of these shorts you're wearing." As Mother takes off Bobby's shorts, he's half hard and she's in the middle of talking and looking at Sara. "I always know what my Baby needs." Not knowing he's freeballing, at the same time his shorts come off his dick some how bounces out and goes right into her mouth an inch or two. Really quickly she pulls his cock out and pushes him back into the chair. "Did you just," "what?" Asks Bobby as he interrupts Sara. "I could've swore you just had....." "What? Had what? Asks Bobby knowing axactly what's she's talking about. "Nothing I guess." Answers Sara, in denial. "I mean it's just that.....," "it's just that what?" Asks Bobby again. "well for starters you're sitting in front of your Mother with your cock out!" "Whoa whoa whoa there Sweetheart. We discussed this, my Mom is just giving me a massage. That's all Baby." "Really?" "Really Baby, that's all it is. I'd have you do it, but you hate the smell of this stuff remember?" "Ya I remember." "Okay Baby good then. Right then Mother puts the medicine off to the side and grabs the K-Y instead. She squirts it on Bobby's inner thigh and starts to rub in. That feels really good Momma." Does it Baby, I'm glad I could help." Says Mother as she massages his thigh and stares at his cock, licking her lips. Occasionally dragging her hand over it non-sholantly. "I hate to see MY Baby in such pain," says Mother as she looks at Sara. "I'd make sure you were never in pain if you were my Fiance Bobby." "Aww thanks Mom, your the best." "You don't mind if your Mother has a drink of her martini do you Baby?" "Naw Momma go ahead, but not too long of a drink I want you back on my caaww....I mean my injured leg."
Mother grabs her martini glass, takes a drink and when going to put it back down purposely spills some of it on Bobby's dick. "Oh no! I'm such a clutz!" "You sure are Momma." Agrees Bobby. "What happened?!" Excitely asks Sara sitting up in her chair. Oh nothing, Mother just spilled some of her martini on me." "Well where's a towel when you need one?" Asks Sara. "I don't think there is one out here Sweetheart." Answers Mother. "And I can't just wipe it off with my hands with this lotion on them." As Mother waves her hands around. "Oh don't worry about it Momma I'll just wipe it on my shirt." Says Bobby as he sits up to use his shirt. "Oh don't be silly Baby!" Cries out Mother as she forces him back into the chair. "I'll take care of it, I mean why, that's alcohol abuse to waste that! I'll get my martini off your beautiful cock Baby." Right then Mother licks his cock really quick. Then licks it again. "What the hell is going on? Have you two lost your mind?" Asks Sara, very upset. "Sweetheart, she's not doing what you think she's doing. She acidently spilled her drink on my cock.......so she's just making sure she gets it all off. That's all! It's not what it looks like." "Are you kidding me, she's sucking your dick. You wont let me suck your dick until we're married!" "She's not sucking my dick Baby! She's just trying to clean it from spilling her drink on it, so it won't be all sticky." "Really? That's all she's doing?" "Ya Baby, that's all." "Well don't you think it's clean yet I mean she's been doing it for a while now?" Mother, deep throating Bobby now and practically choaking herself, reaches back and grabs her martini glass. She continues to suck for a couple more seconds before stopping, looking at Sara and starts stroking his cock while saying, "he won't let you suck his cock Baby?" "No he won't. Is it good?" Sara asks. "It's absolutely wonderful Sweetheart. But ummm.....you know, I wouldn't know Baby I'm just making sure it's clean from this sticky, sticky drink I accidently spilled on it." "Okay then, it just really looks like....you know....you're sucking his dick....but." "I know Baby it looks like I'm sucking his big, hard beautiful cock that you can't have. But I'm not." As Mother goes back down on Bobby's cock for another 10 seconds before coming back up and saying, "Gosh I can't believe how much of this drink is still on here! It goes down my throat so nicely! I better see if my hand can get some off." While Mother strokes his cock with her free hand She takes a drink of her martini, winks at Bobby and then right after swallowing she looks back at Sara and says, "ooops," as she purposely pours some more of her drink on Bobby's cock. "I'm such a clutz! Well better get back down there and clean that thing up huh?"
Wasting no time Mother inhales Bobby's cock, not really caring what Sara thinks anymore. Bobby, not able to pay much attention to anything, leans back in ecstasy and spreads his legs giving Mother more access to his cock. "Bobby." No answer. "Bobby!" No answer still from Bobby. "BOBBY!" "Im sorry what Baby," says Bobby as her snaps back into reality. "It really looks like she's sucking your dick Bobby!" "Don't be rediculous Sara, why would my Mother be sucking my dick when you and me are engaged? That doesn't make any sense. Yeah I'm gonna cheat on my Fiance with my Mother, right in front of my Fiance? Oooohh you do that soooo good! Oh yeah fucking suck that dick!" "Bobby!" Sara cries out almost in tears now, but still sitting and watching. "Oh yeah Momma, you're the fucking best, oh my god! Oh yeah suck it , suck it, suck it." Bobby whispers as he grabs the back of Mother's head and forces his cock down her throat. "You like that cock going all the way down your throat? You like sucking your Son's cock in front of his Fiance? Your future Daughter-in-law?" Mother starts to shake her head yes and Bobby says, "that's right Momma you love this cock in your mouth. You're gonna love it even more in your pussy aren't you?" Mother's eyes open really wide and she almost choaks on Bobby's dick before taking it out of her mouth and whispering, "oh Sweetheart I want your cock in me so bad! Please give it to me. Give it to me now!"
Right then and there Mother stands up and says out loud to Bobby, "why don't we play the horsey game we use to play when you were growing up?" "Alright," answers Bobby, "but I think I'm a little big for you though." Mother looks over at Sara and smiles and says to Bobby without looking at him, "that's okay Sweetheart, Momma likes it big, and you're gonna be MY horsey today, okay?" "Okay, how do you wanna ride the horsey today?" "What are you guys doing?" Interrupts Sara. "We're going to play horsey Sara, it's soooo much fun! Ready Bobby?" Bobby, sitting in the chair stroaking his cock, looks at Sara, then at Mother and says, "Ready Momma, get on!" Mother, licking her lips in anticipation, straddles Bobby and slowly slides down on his cock. "Ooooooohh.....oooooommmmmmm," moans Mother as she eases herself up and down on Bobby's cock. "Oh that's good. That feels sooooo good Bobby. Oh god fuck me," whispers Mother. "I can't believe what you're doing Mrs. Anderson. I'm fucking leaving, I'm not watching this anymore." "What Baby? What's wrong, we're not doing anything!" "Bullshit Bobby, you guys are fucking right in front of Me!" "Oooohh yeah!" Yells out Mother as she looks over at Sara and says, "Sweety, I can see where it looks like we fucking but we really aren't, see?" Mother then takes Bobby's cock out of her pussy quickly and shows Sara that it's not in her pussy and there's nothing to worry about. "Oh, okay, it's just that," says Sara almost in tears but gullible enough to believe Mother. "It's just that it really looks like you're fucking Bobby, Mrs. Anderson."
"Oh Sweety," says Mother as she slides Bobby back into her pussy and starts going up and down really slow. "I'm his Mother, we can't be doing stuff like that! Ha ha ha! Come here and give me a hug now Sweety." "Okay." Sara gets up and walks over to Mother and Bobby and Mother says as she's bouncing up and down, "not too close dear, not while I'm riding the horsey!" Mother extends her arms and Sara does the same. Their hug is a very distant one, one of those that you would give the ugly girl in school. "Okay, now go sit back down Sara while we finish the horsey game." "How much longer do you think it will take?" Asks Sara as she sits down. "OH YES! I really.....couldn't tell you.....how long it's......gonna take." Answers Mother, just barely. Bobby, nearing orgasm starts pumping harder. He looks over at Sara and says, "your ready to go aren't you Baby?" "You better finish up here first Mister!" Interrupts Mother. "Okay Baby, I mean Mom." Answers Bobby as he smiles and starts pounding his cock into Mother harder and harder. "Oh YES!!! Fuck me Baby!" "Take this fuckin Cock Momma, fuckin take it!" "Bobby?" Sara wimpers as she watches on. "Shut up Baby I'm Busy right now just sit there and watch okay." "Ya shut up Sara." Adds Mother as she gives Sara a dirty look, followed up by a look of pure bliss. "Oh my god I'm gonna cum Baby!" Screams Mother. "Cum all over my dick! Fucking cum all over your Son's big cock!" Says Bobby as he pumps long and deep. "Bobby?" Whimpers Sara again. "Shut up Sara! God! Can't you see we're fucking busy, I can't be there to hold your hand all the time okay?" "Okay." Whines Sara. Bobby, grabbing Mother's tits from behind, pulling her back, whispers in Mother's ear, "She's so fucking stupid, ha ha!" "Tell me about it!" Mother adds as she grinds on Bobby's dick and glares at Sara. "What were you two just talking about?" Asks Sara. "Bobby was just telling me how He won't need your pussy when you two get married." "What? How come Bobby?!" "Tell her Bobby. I'm done pretending." Says Mother as she turns her to her left showing Sara her pussy, and Bobby's cock inside of it. "Bobby! You said you weren't fucking her!" Cries out Sara. Bobby looks at Sara without saying a word, crinkles the corner of his mouth, shrugs his shoulders and keeps fucking Mother. "You see that Sara? He'd rather fuck me over you. He'd rather fuck my pussy with that big, beautiful cock of his, that you can't have, than your pussy." Sara, just sitting there taking this abuse, answers. "His cock looks so good, I wish I didn't have to wait for it." "Oooooohhh, I bet it does. It feels good, I can tell you that. I tell you what, I'll let you taste his cum off my pussy when he's done fucking me. What do you say?" "I guess so." "Okay, so tell me again, just how bad do you want Bobby's big cock?" "Bad." Sadly answers Sara. "How bad?" "Really Bad." "You know how good he's fucking my pussy right now with his big cock?" "Not huh is he?" "Oh yes! And he won't give it to you, that's so sad. Oh well!" Says Mother, rubbing it in. "No, he says we have to get married first." "Oooooohhh yes! Yes, yes, yes......Well that probably is that best move Sweety." Bobby, out of no where interrupts, "I'm fucking cumming!"
Right then Mother pulls Bobby's cock out of her and jacks him off, onto her pussy. "Come here Sara, Mommy needs her pussy cleaned." "I don't know Mrs. Anderson," "get over here and lick your Fiance's cum off my pussy!" Yells Mother as she interrupts Sara. Slowly Sara gets on her knees and crawls to Mother, sitting on Bobby's lap. "Well then, I think she'll do just fine in this family." Says Mother. "You mean I'm in?" Excitedly says Sara, in front of Mother's pussy. "I haven't decided yet, get to cleaning." Mother grabs Sara's hair and shoves her face in her pussy. "Oh yeah, that's nice." Says Mother as she turns to her right and starts making out with Bobby. "You've got a talented Fiance here." "Thanks Momma, we'll see how good she is eventually. But I'm in no hurry." "You better not be Mister!" Mother and Bobby continue to french kiss while Sara eats out Mother while commenting, "you're cum tastes so good Baby, I can't wait til I can taste it for real!" Mother, not liking her comments she's making, starts antagonizing Sara. "Oh yeah, how's my pussy taste Sara?" Sara, trying to ignore Mother says, "there's just so much cum down here, it's all I taste and it's sooooo good Bobby!" "Oooohh your tongue on MY pussy feels great Sara. Keep licking please." Prods Mother as she continues to make out with Bobby. Sara keeps trying to touch Bobby's cock, which is in Mother's hands, and keeps getting slapped away by Mother. "didn't he tell you after marriage? If you want my blessings, you'll keep eating my pussy Missy!" Okay," whimpers Sara as she licks up the rest of Bobby's cum off Mother's pussy. A minute later Sara stands up with cum and pussy juices on her face. Mad at herself, and everone else she asks, "are we leaving yet?" Bobby, still in the middle of kissing Mother looks at Sara out of the corner of his eye and starts talking to her while still kissing Mother. "Mmm yef wer goyn." Mother looks over at Sara and slowly lets go of Bobby. With their lips still clinging together, Mother pulls away and says, "it was so good to meet you Sara, please come back real soon." "Likewise." Sara replies very sarcastically. "Sweetheart, you might wanna wipe your face." Says Mother as she smiles. And your make-up looks a little smeared, you might wanna fix that too." "Are we ready yet, God!" Yells Sara as she stomps off and Bobby picks up his shirt and looks at Mother and says, "you just had to be yourself didn't you?" "What can I say?" Mother answers, "you wouldn't have it any other way and you know it." Bobby, looking at Mother's naked body and then back up at her saya, "no I wouldn't." "BOBBY NOW!" Yells Sara from far away. Bobby smiles at Mother, gives her some quick tongue and takes off running with his shirt in his hand. Mother is left standing playing with her pussy, saying to herself, "I've got the best family in the whole world." End of scene.