This story begins immediately following the last panel of the Kimcest story line that I could find.
"Shego! Leave Ronald alone. He's got nothing to do with this!"
"You know Mrs. P., you're a little too eager to defend Kimmee's sidekick. Sounds like you want in on the action. What's the matter
? Getting dicked by your daughter and me isn't enough? Gotta have one of your own, is it? Well we can certainly help you out there.
Having said that, Shego turns and zaps Kim's mom with Drakken's Molecular Transgender Inducer. The results? A dick every bit as large and hard as the one the device gave Kim.
"Now that you've got a dick, I think I'll let you have first crack at the sidekick."
"Surely you can't mean that? Ronald's like another son to me. I couldn't possibly do it.?
"Of course you can. You've already been fucked by your daughter. Why not turn around and give some hard cock to the sidekick? Besides, better him than involving the boys, isn't it?"
"Not the boys! I'll do what you want as long as you leave the boys out of this."
"Wait a minute! Don't I have any say in this? I don't know what's going on here, but this is seriously wrong!"
"Ronnie, what's going on is Dr. D and I have been having a little sex party with Kimmee and her mom. Since you decided to butt in, we've decided to have you join in on all the fun. Once we're done, I'm sure your part in it will be popular once we release the movie. Now strip and let Kimmee's mom do whatever she wants to you."
"You can't make me!"
"Oh, but we can! You see, we got Kimmee and her mom to cooperate by threatening to involve the twins. As close as you are to Kim, you wouldn't want her to know the twins got involved because you refused to cooperate, would you?"
"No, I wouldn't want that."
"I'm sorry Ronald. If I had a choice, I wouldn't do this, but I must. I'll try to be gentle."
Having said that, Kim's mom began to slowly caress Ron's brand new pussy while slowly tonguing the nipples on his brand new tits. Kim's mom knew she was making Ron feel good by the swelling clit and moist lips expanding under her fingers.
"See, Ronald. That's not so bad, is it? I'm sure you're going to enjoy what comes next."
With that, Kim's mom lowers her head until Ron's pussy is right in front of her. She begins to lick and suck Ron's now thoroughly swollen pussy. At first Ron just lays there, but as her tongue probes deeper inside him, Ron gradually raises his hips to give her better access.
"O-h-h-h! Mrs. P., you were right! That does feel good. How can anything so wrong feel so right? I feel like I'm going to explode!"
With that, Ron grabs her head and pulls her down hard on his pussy. Forcing her to lap all the juices erupting from him.
"Ronald, you were good, but it's not over yet. I'm going to make you come all over again. When I'm done, you'll know what it's like to be thoroughly fucked as a girl."
While saying this, she's raised herself to position her swollen dick at the entrance to Ron's pussy. Ron realizes what's happening only when the head of her dick begins to push its way slowly between the lips of Ron's pussy.
"Ow! Ow! Ow! Please stop! That hurts!"
" I know Ronald, but I can't stop. Don't worry about it. Soon you'll be enjoying this dick inside you as much as you enjoyed me eating your pussy."
Kim's mom was right, of course. It wasn't long before Ron did indeed enjoy having her dick plunging deep into his pussy. Without quite realizing that he was doing it, he was soon pumping his hips in time to each stroke of her dick.
"Ronald, are you ready to cum? I want to feel you gushing all around my dick when I cum in you."
"O-h-h-h! Mrs. P., don't wait. I need to feel you cumming. I'm ready to cum now myself."
Having said that, Ron did cum. His orgasm triggering Kim's mom to spew her own load deep inside Ron.
"There now, that was fun, wasn't it? Oh look, Kimmee's awake. Look Kimmee, we've decided to have an even bigger party. Now it's your turn at your boyfriend's pussy."
"Ron, are you okay? Drakken and Shego didn't hurt you, did they?"
"Don't you worry Kim. You do what you have to. It'll all be over soon."
Speaking bravely, as if he was accepting his fate relunctantly. In actuality, looking forward to having Kim fuck him now that he knew what it felt like.
"Just a minute! I was going to take a crack at his crack myself when your mom interrupted and wanted to get in on the fun. I'm going to take my turn now. You, Kimme, are going to show your sidekick what it feels like to get a big, fat dick up the ass. Now you go over there and sit on it!"
Seeing that he has no real choice, he does as he is told. Knowing what to expect, he doesn't cry out in pain, but does moan as Kim's dick stretches his virgin ass. Once firmly set on her dick, Ron's legs are forced open by Shego and her dick is plunged deep into Ron's pussy.
"How - does - it feel - to - be - double - fucked?" Shego asks. Each word coming at the end of a stroke as her dick shoves balls deep into Ron's pussy.
At the same time, Kim's dick is equally busy stretching and filling Ron's ass. While she's dicking his ass she reaches up to play with Ron's tits. Tweaking each nipple between two fingers.
"Unh! Unh! Unh! I'm hating every minute of it. Get it over with, will you?" Trying to disguise the fact, rather poorly too, that he's enjoying it all too much. This being proven a lie by his hands pulling Shego deeper into him with each thrust of her cock while his hips are raising up to meet her.
A real triple play as all three cum at the same time.
"Kimmee, we're not done yet. You mom sucked your dick and now you're going to do the same for her."
"Mom?"
"Don't worry, Kim. I know you'll do what's necessary. As will I. I'll try not to make you gag when I cum."
"I'll try my best for you mom." Reaching down to take her mom's already swollen dick between her lips.
Oh Kim! Your best is almost too good. Keep doing it like that and I'll be cumming soon." Meanwhile forgetting her promise not to gag Kim. Thrusting her dick deeper into Kim's mouth as Kim brings her closer and closer to cumming. Not that Kim notices. As she started sucking her mom's dick, Shego has pushed Ron into sucking Kim's dick. Shego then takes on another dick ride, shoving her own dick into Ron's ass. Kim's mom shoots her load which Kim eagerly gulps down, This causes Kim to shoot her own load of cum deep down Ron's throat. At the same time, Ron gets his assed filled with Shego's own load of cum.
Part two of this story ends with our heroine and her family thoroughly exhausted, but also thoroughly sated sexually. All hearing the warning from Drakken and Shego that they'll be back for more.

thank you for this

You're welcome. I've more in mind, but haven't quite worked out the details.

hey that was pretty good.

a perfect ending...

"Well, now that that is over with, we all need to clean up. Hmm, considering your condition, I think we should rename you Ronni, don't you think Ronald?"
"What's the matter with Ron?"
"Come on Ronni, look at yourself. You certainly don't have the equipment to be a Ron anymore."
"Whatever, we all need to clean up. Ronni, you can use the upstairs bathroom while Kim and I clean up down here."
Ron, grumbling about the name, walks away, a little bowlegged, to clean up. This leaves our hero(ine) alone with her mother.
"Oh mom, I'm so humiliated! How could I do and say such horrible things? It's like I had no control over myself."
Oh Kim, I know how you feel. Even though I was thinking how terrible it was to be forced to do those things, I couldn't help responding to everything like I was some kind of cheap slut. Still, I think I know why we both had such spactacular responses to it all. It helps that I'm an expert in neurology as well as a top brain surgeon. The way I have it figured is that Dr. Drakken's device not only changed us physically in giving us these long, thick dicks, it also changed our entire brain and nervous system. It lowered our inhibitions to such a level that we couldn't help, but be driven to say and do things that led us to such enormous and satisfying ejaculations."
Of course, while this was all being said, they had started the water running to shower off.
" Any least amount of stimulation can have us seeking fullfillment again. We have to be extremely careful in what we say and do."
"Mom, I think you told me too late. Look! I'm getting huge again just from washing myself."
"Oh Kim! I was afraid of this. Seeing you all slick and soapy and responding like that is getting me hard too. I'm afraid we're going to have to do more of what Dr. Drakken forced us into before."
Having said that, her mom reached over and began playing with Kim's soap slick tits. Tweaking each already hard nipple in turn.
"Oh mom! Don't stop! Use your mouth too. I want to feel your lips and tongue on my tits."
"Mmmm! You taste so sweet. Such perfect tits and nipples hard ike cherry pits."
While saying this, mom has reached now and delicately begun stroking Kim's now completely hard cock.
"Oh mom, that feels sooo good! Suck my dick, please! I need to feel your lips and tongue around my dick."
"You mean, you want me to do this?"
Saying that, mom slowly slides her lips down the length of Kim's dick. Probing the dick's head with her tongue while her lips slide further down the dick's shaft. Gently sucking as she pulls her head back off the dick. Then repeating it all, faster and faster as she feels Kim's throbbing response.
"Mom! Stop! I don't want to cum so soon. Let me rest a moment."
"Oh Kim, I'm afraid there's going to be no rest for either of us. I need to feel that huge, hard dick of yours cum. I want you inside of me when you do. Take that cum filled dick of yours and fuck me now!"
While saying this, Kim's mom has turned around and spread her cheeks so that Kim need only push forward a little bit to get here dick in her mom's now completely open ass.
"Oh mom, your ass is so hot! I want you so much."
"That's it Kim! All the way in! Slam my ass hard with that dick of yours. Oh fuck! That feels so good!"
"Unh, unh, unh! I - want - you - so -badly. I'm going cum for you! OH! Take it all."
Oh Kim, that was so good. Now you turn around so I can have my dick fucking your ass."
"Oh mom. You don't need to tell me twice. I need to feel your dick in me. I want you to fill my ass with you cum."
"Oh Kim, you have a really hot, tight ass! I'm going to make this last as long as I can."
Saying this,Kim's mom begins pumping her ass with long, slow strokes. Pulling the dick back until only the head is still in and then pushing forward until the shaft is buried completely to the hilt. Even though she said she wanted to make it last, it wasn't long before Kim's mom was ready to spew her load.
"Oh Kim! I'm going to cum!"
With that, she thrusts her dick as deep in Kim's ass as it will go and begins to fill Kim's ass with her cum.
"Oh mom. That was tremendous! I know this is all wrong, but it felt sooo GOOD!"

In the mean time, Ron(ni) is discovering the same thing on his own.
"Ronni, what kind of a name is that? I'm still Ron and I'm going to keep it that way, no matter how much I change on the outside."
All the while he's saying this to himself, he's begun to soap himself up. Of course, his body is responding to this by becoming increasingly aroused. Not that Ron(ni) notices at first because he's too absorbed in complaining about what's happened. Still, he does eventually notice.
"What's happening to me? I feel kinda strange. Nice and tingly all over."
Having noticed, his hands wander absent mindedly to his tits. At first just holding them, but the n as his body responds, he begins to squeeze them and play with the nipples.
"Why am I doing this? It is so wrong, but feels so good. I gotta keep going. I want more of this."
Keeping one hand on his tits, his other hand slowly slides lower until it reaches his no longer new pussy. Where his fingers easily slip into his now wet opening.
"Oh man, this is so good. I feel like I'm going to explode!"
He's saying this to himself as his fingers find and play with his clit and probe deeper inside himself. Probing deeper and deeper, stroking faster and faster as his body builds to a climax.
"Oh GOD!, I'm going to cum! A-H-H-H!'

Check out my additions to Kim Sex part #2

I got to admit it's nice man XD

Liked it alot actually thx for the story mate

Good job and thanks for the story