It was one of those stormy nights at Springfield, the rain was heavy and it felt like it would take a while for it to dissipate, and right now? Homer, the man of the house was on a road trip with the kids for a bonding experience just for them, of course, that was the blue-haired wife, Marge's idea since they needed that, sure it seemed like a bad idea thanks to her husband silliness but for some reason, Marge didn't seem to care right now, since she had the house all to herself. But Marge wasn't all alone there, of course, her sister Patty was there to keep her company, they would reunite from time to time to talk about things, for some reason Selma wasn't there today.

"Thank you for staying with me for now Selma"

"No problem Marge, it's a pleasure"

They were both sitting on the couch, Marge had made some hot cocoa for them to drink later on.

"But…you see there is something I wanted to tell you. Last week something quite unusual happened to me"

Marge was now curious as she rarely sees her sisters talking seriously about something that is not related to smoking, hot guys, or both. There was also talking shit to her husband but that was more mockery than serious.

"Really? What happened?" The blue-haired wife asked.

"That nerd Flink told me to take this experimental pill which was supposed to make me a young teenager again according to him, but it would give me some weird side effects" She revealed to her.

Marge looked at her with a look that said she didn't approve of that "First of all, you don't look any younger, and second of all! How could you do something so reckless? Testing things like that is dangerous" The sexy milf Marge said so to her Sister.

"Pfft whatever Marge, but not all is bad, maybe I just need to keep taking it, the side effect is already here, let me show you"

Patty smirked before slowly lifting up her dress and revealing to her young sister Marge what appeared to be a protuberance of great size forming on her panties. The housewife gasps at that not knowing what she was actually seeing, a part of her knew what it looked like but it didn't seem to accept it.

"Wait..what the! Is that a…"

"Surprise huh? Yep! Looks like I got a dick now Marge, and guess what? It's big, veiny, hard as a damn rock! And it twitches all the damn time. That nerd told me that while the effect on my age was minimal, this side effect is going to last one whole year" Selma then drops the smirk and shows a tiring look "At first I liked how it felt but then with time it became too hard for me to have it, I have masturbated three times today already to make it go down but it won't Marge, I can't even nap in peace without this thing constantly asking my attention"

To say Marge was surprised and shocked was an understatement, she just couldn't believe that this was currently happening in her own house "Oh my god! Patty, what did you do to yourself? This is crazy"

"Well that is where you come my dear sis, you're gonna help me with this" Patty smiled, looking at Marge's body.

"Huh? What can I even do?" Marge asked, failing to realize what her sister just implied.

"Marge, I need you to help me get some well-deserved release from this meat log, or else I might lose my damn mind and end up assaulting someone on the street before screwing them for hours. My hands are not enough anymore! Marge helps a sister out" Patty asked, basically begging for Marge to have what was obviously an act of incest.

"W-What!? Have you lost your mind, Patty? We are sisters!"

"Come now Marge, are you telling me you're not even a bit curious? I mean I bet I'm much bigger than Homer

The woman that loved smoking then takes off her dress and removes her panties letting her twelve-inch hard throbbing cock out for freedom, surprising Marge at the size of the biggest dick she seen in her life.

"Holy shit, t-that's massive!" She gasped, looking at it.

"It also feels amazing. Never thought a man's orgasm could feel that damn good. Now I know why all of them are constantly thinking about sex. I also do that but you know...never fucked anyone with a dick before" Patty admitted.

"I-I don't know…maybe? I mean…" Marge was reluctantly but something kept pushing her "I suppose it would be irresponsible to let you go like this"

"Oh thanks a bunch, sis, you have no idea how much that means," Selma said with a wide smile.

Marge gulps down nervously before she goes for it and grips her sister's newly acquired sausage on her hand. It felt warm and it twitched as she moaned by the touch, starting to stroke it slowly up and down the shaft.

"Geez, Your balls are the size of oranges! How did he manage to do this to you?"

"Ahnnh~! Cmon Marge don't ask too many questions and focus on giving me pleasure" Patty said, feeling really good

"I just hope no one ever finds out about this, h-here I go"

The blue-haired woman starts to be bolder and puts her sister's dick on her mouth to suck on the tip while her hands are busy, the left one stroking her shaft and the right one squeezing her balls lightly.

"Ohhh! Ahhh! Yeah, this is it! That's the stuff!" She said, clenching her hands on the couch in pure bliss.

Patty was enjoying this quite a lot, so much in fact, she went and grabbed Marge's head and shoves her entire length on her throat, the latter was in surprise and could not do anything to prevent her sister from using her head as a fucktoy as she pulls it up and down on her dick many times getting all of it slippery, not wanting to wait for Marge to get used to her size.

"YES! YES! YES! MORE! MORE!" Patty said, looking to the ceiling with her tongue hanging out, and looking as if she was drunk on the new sensation.

Marge was gagging with all this movement, Patty's cock was being covered in saliva as she got up from the couch and began to facefuck her sister hard! Moving her hips fast like never before. Marge was getting the most hardcore blowjob of a lifetime, as she could only imagine what would happen when she finally c-

"AHNNNNN! I'M CUMMING!"

The Bouvier sister gives a final thrust as her balls gland expands before unloading streams of thick warm semen down Marge's throat while her eyes were going up to her head and bits her lower lip while filling her sister's stomach with her seed for a whooping good ten seconds before pulling it out making a mess on the floor with some of it that had ended up falling down.

"Ahn...this…this sure hit the spot, ten out of ten phew!" She said, with a breath of satisfaction.

The blue-haired woman falls on the floor coughing up, getting back some air from what had just happened to her and this was by far not what she expected to happen. Patty looks at her sister trying to get back her oxygen and looks at her nice and round booty! It was such a waste to have such an amazing body to that fat fool. Soon enough she moves on the same level as her sister and grabs her big ass cheeks with her hands making her yelp.

Marge looks back "P-Patty? W-What are you doing?"

"I bet you never had a big one like this before. Thank you for the pleasure Marge, now allow me to give you a true humping session"

"N-No way! You're still hard?" Marge asked, in fear.

"Of course! Does your hubby get tired after a simple load? Haha, don't worry I won't go down that easily"

Getting in a Doggystyle position Patty starts to slide her dick inside Marge's wet pussy making her moan loudly all the while having such dick getting inside her like that was even more embarrassing than having an orgasm for getting so wet by having her sister fuck her face"

"HMMMNNG!" Marge moans and later grits her teeth.

"Fuck! You're so tight Marge, I knew that man wasn't stretching you good enough, having a dick never seemed so good like right now" Patty said, loving it.

Starting to move her hips in and out she is now humping her own sister from behind with her big futa dick and didn't seem to mind her asking to go slower. Pumping her length like the world was about to end and making moanings fill the room enough to make someone wake up from the grave.

"Annnnh! ahnn! ahnn! This is so intense" Patty moaned, getting sweaty.

"Hann! Ahnn! AhnnN! s-stop, please! Your t-too big and ahn!" Marge moaned, feeling her sister rearranging her insides.

"Your pussy has become my favorite pussy now Marge! Whoho!"

The Bouvier sister said before letting out the biggest moan along with more loads of sperm, this time inside her sister's womb while holding her tight for dear life, who was also screaming making a mess on the floor as pleasure fluids were squirting over. After that, the smoker woman took her dick away from Marge's pussy and now was finally limp and smaller.

"Just in case you don't know but this sperm is not fertile enough to make someone pregnant I check it," Patty said, remembering to say that.

"Hnn! Y-You could say that sooner…oh go m-my pussy...you fucked me so hard. I can barely feel my legs" Marge panted hard, feeling like she was ruined for any other man.

"Don't be such a wimp Marge, it will come back to you when time is right. Well, I am gonna go take a shower and clean myself. Feel free to join in if you want sweet cheeks" She said, spanking Marge's ass as she moaned.

'Oh dear…what did I get myself into?' She thought, not sure what to expect for the next week.