It was a normal day at Langley Falls, nothing too insane was happening which was a given. At the smith's residence, everyone was having a good time in the yard, Stan had planned a barbecue for the family to enjoy on Saturday but someone else was going to come as well.

Steve Smith the geeky boy had managed to have a girlfriend...Debbie was her name, he had already presented her to the family which at first was not a problem, most of it was because of his dad having a problem with her being fat or something but it was all done now. The boy brought her to their little get together so they could swim by the pool with his family.

''Look at them Stan, aren't they cute together?" Francine said stating at Steve happily talking to Debbie.

"Y-Yeah''

Stan was not very much happy about this, for what they didn't know was that the guy didn't passively hate Debbie for being fat when they first met, but because of one thing only...

Her fatass...Debbie had such a big booty that it would jiggle with every step she took, her belly was just a little bit chubby but what was really FAT was that fucking derriere that was always in full view even with her modest swimsuit that was not slutty or sexy but still made him want to FUCKING look at that butt. Every time she came to his house and every time he has seen her outside in the streets, it was a battle of wills to not stare at that teenage guy phat booty.

Stan spent most of the time trying to prevent himself from having an erection, thinking about unsexy thoughts the whole day. But when he accidentally saw Debbie bend over once to grab a wiener she had dropped on the floor and throw it away….he just couldn't take it anymore.

He told his wife that he needed to take care of something and would come back later on when done with it. But what he really meant inside was the need to masturbate in the bathroom until he drained his balls from every lustful thought about Debbie.

Going upstairs while sighting in defeat, his boner now raging hard against the fabric of his shorts and unprotected by his hands. Stan was not ready for what he met just around the bathroom door.

"Hey there " Debbie said with a smirk.

"BWAH!" The man shouted in a scare "D-Debbie? What are you doing here?"

"You know...I have realized that you could not take your eyes away from me there. And by the looks of your soldier, I think the answer is obvious" Debbie said with a low seductive voice while looking at his crotch.

"Ahn...W-Well you se-"

"Shhh...Not another word , how about you get inside the bathroom and...show me what your packing" She said with a straight face.

Stan is shocked to hear Debbie say that, he thought she would call him a pervert and kick him in the balls. But that? What could he possibly expect?

"Debbie, what are you asking?" Stan is surprised.

"Don't play dumb, do as I say or things may get a bit complicated. And by that, I mean screaming loudly and saying you were spying on me in the bathroom"

The American man realizes that Debbie is being serious, gulping down, and feeling somewhat nervous, more than he wants to admit it. Stan opens the door to the bathroom and Debbie follows suit, she also locks the door before he can say anything.

"I gotta admit Stan" She now used his name "You of all people getting a boner because of me?"

"Ahn…Y-Yeah?" He started sweating.

"What part of me did you liked that much?" She teased him while looking at his boner.

Feeling like a teenage boy all over again Stan feels embarrassed at how she played at his hand. one wrong move and everyone would come there because of her, he couldn't take too long.

"Your ass ok? Damn it, your ass is so goddamn fat it turns me on. There I said it" Stan crossed his arms.

"Oh my! Is that so?" She giggles "Why a fan of fat butts married skinny women like Francine then? Well, I suppose every man can have more than one taste" Debbie said in a way that talked down on Francine.

"Hey don't say it like that, she has plenty of sexiness too, it's not my fault. A married man is still a man, and we get aroused because of other women too" He said like trying to defend something important.

"You got that right"

Debbie then surprised Stan by running towards him and grabbing on to his shorts, pulling them down to revealing his penis.

"AH!" He said surprised not expecting the bold move.

"I also feel the same way towards you, and I gotta admit….not bad"

Debbie took a good look at Stan's hard erect member, a full 6.5 of the length of meat, and a circumference of five. A big and long meat log that she loved to look at inch by inch.

"Now that's a real dick, all that because of me? Such flattery" Debbie smirks while drooling a little.

"Oh no! My man tool is exposed," He said trying to cover himself.

"Stop being such a baby, with a dick like that you should be doing something else. Tell me, Stan, aren't you tired of having the same women every day and all the time? Sure your wife is hot and she has experienced, but every man wants to spread his wings a little...further away from the same easy meal"

She then walks towards him getting closer, the guy starting to get more turn on staring at the hungry eyes his son's girlfriend was giving him.

"How about I make you have a little more fun today? Different from the usual"

"Ahn…" Stan shudders.

Meanwhile outside with the family…

"I'm glad dad and Debbie are getting along now," Steve said.

"Don't worry Steve, your father can be a real pain in the ass sometimes, but give it time and he will get used to anything and stop being a little bitch" Francine answered.

"Well, I just hope this lasts. I don't want to hear more innuendos about fat people or jokes when she is around, with luck maybe Dad finally became a little more open mind"

"With luck maybe he would even agree to you being gay if that was a thing" Francine laughs

Back to Stan…

"Ooohhh"

The American man was sitting on the toilet seat (lid closed) enjoying Debbie amazing handiwork, the way she wrapped her fingers around his shaft and started rubbing it up and down while using her free hand to grope his balls was so good and refreshing, his wife was just always annoying him on other things, she stopped trying which also made him stop trying.

"You like that huh? A married man having his son's girlfriend doing naughty things to him, isn't that a turn-on?" Debbie giggled.

"Y-You the one who w-wanted it too" Stan groaned at how she speeded the process.

"True, but that's because I can't resist big boners like yours"

Debbie started licking the tip of his member slowly making him feel more pleasure before she started doing it in swirls. His dick tasted good, just the way she wanted was Steve big like him? Maybe, she just wishes he is not disappointing.

Proceeding to show his mouth skills Debbie starts to deepthroat Stan member until reaching half of it, then coming right back up leaving a trail of saliva in slow movements first. Then when the terrain was explored the thicc girl started doing it faster.

'Damn it...she is so good at this, Francine sucking skills are not as good as hers. Fuck! I'm sorry Steve, but I'm going to have sex with this chubby bitch' Stan thought while biting his lip.

While Stan was having a good time Debbie then stops to give him the blowjob, when he asked why she stopped, the latter just grinned and turn around showing her fat booty. Then began by slowly taking off her lower bikini part, allowing the American dad to stare at her Pawg ass, the white big booty that turns him on so much.

"I can't let you blow your load before getting a taste of this now can I?"

Bending over and moving her ass like she is trying to park a car in the parking lot, Debbie manages to get Stan throbbing cock lodged between her mound cheeks like a sausage in buns. He moaned in delight feeling how soft and warm that teenage girl thicc cheeks felt around his cock, it sure was an exhilarating feeling.

"Ohh God" Stan grunted.

"Now time to shake it off"

Debbie started shaking her rump in a twerking fashion, the now throbbing dick stuck in a flesh prison as the Buttjob of a lifetime is taking place. Stan was a man who had sex with plenty of women back in his not married days, some more beautiful than the other due to either sheer luck or actual skill. But never has he meet one with such a fine ass and do something like a buttjob, it really made him feel great.

"So good, oh man this is the best" He started to moan and let out his true thoughts.

A little more of that was enough to make him lose his cool, Debbie felt his member twitch and speeded up even more while giggling. Stan wanted to moan as loud as he wanted, but that would attract people, so he pushed both hands at his mouth while his little friend unleashed his pent up sperm shot after shot, his moans being muffled as Debbie booty is covered in the white stream.

"Look at all this mess my big man did, looks like you really dig girls with a nice behind huh?" Debbie said looking smug, before getting off his lap.

"Ohhh...I have sinned and...it felt amazing" Stan smiled, now thinking only on how good it felt and not how wrong it was.

"Do you want to feel even better?"

Stan looked down seeing Debbie who had gone in the best position call face down and ass up jutting it towards him in a sexy fashion. Her legs spread wide exposing her pussy who was wet after all the action, love juice dripping on the floor making Stan realize what she wanted.

With confidence and no more embarrassment he does just that, getting up and taking a quick look at the fat butt, Debbie feels a good slap across her cheeks making her squeal!

The man loved that, to dominate a sexy female and feel like the alpha.

"Hold on to your voice bitch, I'm not done slapping this ham up"

Stan said delivering a few more slaps with enough force to make them ripple like jelly, turning a bit red by the repetitive action.

"Oooh j-just fuck me already," Debbie said in a low voice.

Stan had an idea after she said that, Debbie knew how he was having a hard time hiding his boner from her, then she just walked towards him acting all high and mighty wanting to get the best of him if he didn't cooperate. Well now it was time for him to take it back.

Instead of going at it slow and enjoy that pussy real good, the CIA man instead acted like a caveman and just fucking slammed his shaft right deep in her womb. Debbie was caught off guard due to that, but her scream was unheard as Stan's hand covered her mouth. His dick going real deep in her vagina, her hips being gripped by his other big hand, and with his trained physical body he starts to deliver intense thrusts with all his might fueled by pride and lust.

Debbie rolled her eyes to the back of her skull, muffled moans as she gets humped by Stan like an animal. He started going at it with more intensity, his thrusts much faster, letting all of his stress and what not by dominating that pawg ass goth girl who thought she would take him. She could feel how his shaft rubbed her insides so rapidly, pushing every inch with his log, but she was also enjoying this, her body moving and rocking in a repetitive motion, the goth girl couldn't say anything all she can do nows moan and breathing heavily as he didn't stop. Stan wanted to keep on fucking her as the sex rages.

'Ahhhn! ohhhhg! Fuck fuck fuck! OHH N SO BIG! OH YEAH FUCK ME' Debbie moans were loud and muffled as she hollered in pleasure inside her mind.

"HMMMM! This is what you get, enjoy the ride slut"

Stan grinned widely while his free hand covering her hip went to give a grip to her firm ass in delight. Her butt was grabbed and squeezed like dough, giving a few more smacks while thrusting. Sloppy sounds from all the fucking got louder and her juices were dripping like a waterfall.

Stan was going wilder than he ever had gone with his wife, the goth girl felt how fast and strong the man was fucking her, to the point where she couldn't keep up with, going balls deep to her snatch with such big tool was putting her own experience to the test. Debbie couldn't speak but only moan and breathing heavily. She felt that she's being dominated by the intense heated sex from Stan, she enjoyed every moment of it and enjoyed the fact that her boyfriend's father is dominating her endlessly.

Stan enjoyed dominating that phat assed teenage girl, her she moaned with an erotic tone, but then his shaft started throbbing as a sign that he's getting close to his limit, deciding to tease his son girlfriend some more, he delivered more smacks that had her 'squealing' after that he gritted his teeth and unleashed a thick load inside her womb that finished the job quite nicely, his balls draining up every drop.

The sex was wild, sticky, and intense. Yet quiet and secretive from everyone else. Letting go of Debbie completely Stan started breathing heavily, his dick now limp and his body sweaty.

"That...was...wow. Debbie, I think I prefer chunky girls now more than ever" Stan said smiling while looking at her.

"Yeah and... I think I'm gonna need more from this if your son turns out to be smaller and less active then you" Debbie moaned while looking at the ceiling.

After that Stan told Debbie to go take a shower while he went to put his shorts back on and put some perfume to take out the smell of sex. He could never let his son know the truth or anyone else of what he had done.