Saturated Fat Sis

The quarter pounder patties, maybe a dozen of them, sizzle in the grill, as I prepare the evening meal. Greasy. Thick with saturated fat. Most of it not for me, but for the person currently occupying the bathroom, and making a stink of it. I can smell it from here; the smell is thick enough to leave the burgers stinking of -Mira's- my sister's rotten farts - a mix of digested cheeseburgers, spicy chicken, pizza, all manner of unhealthy junk food. Yes, that's my sister in the bathroom. My fat, sweaty, fucking morbidly obese whale of a sister. Who leaves the door open because she might want my assistance. My lovely, fat sister. Who I love dearly, and deeply. You see, our fucked up chemistry makes us both siblings and spouses, brother and sister, boyfriend and girlfriend. Perhaps that alarms you. But it's always been the same. We've been living like this since well, she dropped out of university. She hasn't always been this big, oh no. She used to be a little chubby. Just a little thick around the middle, with a cute, pudge-padded face. We've known each others' bodies intimately, since our early adolescence.
So you can imagine, I know just how she looks sitting on that toilet, with her massive belly (of course, not always that big), covered in several rolls of fat - thick mounds of jelly around her abdomen, her lower belly roll the biggest. A massive, misshapen ring doughnut around her waist, protruding forward over her very thick thighs - which chafe, naturally -  her lower stomach roll protrudes so far forward, it's almost at her knees when she sits. Her lower belly roll, massive and all-encompassing as it is - weighing as much as a fat child, I'm sure - hangs around her side, and is easily as wide as her butt - in fact, as it goes round, the back of her enormous tummy and the start of her butt are indistinguishable. So fat is she, you see, that her lower tummy roll and butt have merged. It's so lewd, she always pulls her panties over her lower gut, and massive panties they are! Her upper tummy roll starts at the point where her bellybutton should be. Instead. it's covered by a huge mound of fat which rests on lower section of her gut. You know how sweaty it is inbetween those two rolls? Believe me, I've been there. It's a swamp, just like her massive ass. Her ass which is so fat she can barely clean the surface of her buttcrack, inside which lies a crevice filled with the most disgusting sorts of filth. It's no wonder her panties are so disgusting. It's no wonder I take great joy in cleaning them personally, as her brother, boyfriend, and feeder. I have to stop myself jerking off into them. Not that she'd mind, probably. But I haven't let her on just how much her filth excites me.

Now, back to the present. Today is just a bit strange. Her diet lends itself to constipation. Being a sugar, fat, all-round junk food addict, Mira's bowels - constantly overstuffed as they are and encased within a huge mound of flab - inevitably take some time to work. So that's usual. But she's normally ready in time for dinner. I hear the occasional grunt from the bathroom as I finish up, preparing the huge cheeseburgers. I swear they still stink of the cheeseburger farts she made today. Greasy to the touch. Doesn't this excite her enough? She'd normally come huffing and puffing, eager to scoff them into her cute, fat hamster cheeks. But not today. "Bro...." she whimpers, "it won't come out..." I thought not. I can normally hear every last, dense, fat log that lands in the pan. Today, nothing, only her high-pitched grunts as she pushes, to no avail.

I go into the bathroom, to see her flabby hands clutching her immense, constantly bloated gut. "All blocked up?" I tease her as she blushes, "maybe it was all that pizza last night, sis..." Of course, the sight of her almost naked body - her incredibly over-filled bra holding udders which rest against her multi-tiered pudding belly; her immense thighs which rest upon fattened calves - all of it excites me. I don't even attempt to hide the bulge in my pants. Time for a big, fat belly rub.

---

I love it when my bro rubs my tummy like this, when I'm all blocked up. Pounds and pounds of my shit-filled bowels underneath hundreds of pounds of fat. Hurts so bad -- I'm such a medicated pig. First it was Ritalin. I had to take that at school, because of my short attention span. At first it helped, but then it just.... pushed me over the edge. So they put me on Zyprexa instead. ADD meds withdrawal made me hungry as a fat sow. Anti-psychotics made me hungrier. So, I ballooned. There wasn't a day I wasn't scoffing down calories. I was only 175 back then. Chubby but not a whale. Now, I'm about... double? I lost count. I'm not even sure whether it's the meds or just me, anymore. You'll have to mind me if I say something stupid, sometimes these meds make me a bit slow in the head. Sometimes I feel like a zombie, who can do nothing but eat and poop and sleep. And forget about anything smart, I don't even remember what I went to uni for. Makes my head hurt almost as bad as my tummy. I'm mentally constipated. Not dumb, I assure you, just... slow.

"Bro, rub harder.... it's not coming!" I beg him in my embarrassed tone, as all I can release are trumpeting farts.

---

I'm rubbing as hard as I can. It feels hard underneath all that softness, when I knead her fat deep enough. But this mass doesn't feel like it's going to move so easily. Perhaps there's another way. "Sis, maybe I should try something else." I whisper in her ear, as if what I'm suggesting is so naughty and scandalous even a fly would spread rumours. To my surprise, she pleads eagerly. Her desperation is both in her bowels and in her crotch at once.

---

Brother is so dirty. That's why I love him so. Huffing, I get up off the toilet. Such a strain, I think my butt is sore. "Ow!" I say and wink as I feel him slap my butt as he calls me a fat sow. As he says, I bend over, hands and knees on the bathroom rug, my heavy gut spilled over the floor, weighing down on my back. My bowels feel some pressure like this, but it's not enough. "Don't overdo it..." I say, with constipated gasps. Please overdo it. Please release this horrible lump of shit. This position is hard for me, as such a big girl. My massive thighs chafe, it's hard for my flabby legs to hold up my bum and gut in the air - but I keep them up. Ready.

---

I grab her waiting, obese rump which teases me so, squeezing on her soft, bountiful, sweaty ass flesh. You see, I'm also desperate. My bladder is full to bursting. I've been neglecting to go for a piss all day. I thrust my hard dick inside her, holding off with my last shred of willpower and strength, pushing my phallus deep inside. I mustn't let go till I'm right inside her. Now I feel it, with the tip of my dick. I'm touching her faeces. She moans.

---

"Ahhh! This is worse!" I feel my shit being pushed up by his dick, deeper into my over-filled bowels, the backlog of shit being compressed into my colon. "Not so deep!" His dick is another turd, filling me up like a human toilet, to breaking point. Now I feel it trickle inside my butt. Deep inside me. I touch my gut with one hand, as I feel his hot, warm, disgusting piss fill up my intestines. A chill goes down my spine, as if I'm peeing in reverse. The sausage mass of my colon, being impacted even more. The urge to shit is even greater. I bite my lip, it hurts so bad. Uh oh. I can't stop myself.

---

I hear a trickling, but it's not my own. "Mira..." I gasp as I release my whole load of piss, backed up all the way into my kidneys. Her own sugary, feminine urine trickles onto the floor, but also onto her lower belly roll due to its trajectory. It stinks of hormones. "Feeling the pressure already?" I squeeze her fat, torturously distended gut, hard, not even avoiding her stream of piss.

---

"We're so disgusting," I manage a pained grin, gasping. The pressure is building further. "Just how much pee do you have? Ughh" I can't even tell whether he's peeing or not. No, he stopped. He's moving. Pounding my bowels. The pain, and the ecstasy, are both indescribable. My tummy starts to jiggle. My bowels move with pained movements. I'm wet down there, and it's no longer my piss that's trickling onto my belly or down my thighs. "You jerkoff.... I didn't say you could fuck me too." I complain like a spoiled prize piggy. It really hurts. I'm full of dense sausagemeat.

---

"Well we have to make sure it all comes out, sis. No half measures." I kiss her, passionately caressing her lewd, greasy flab. She's getting all worked up with sweat. I can tell how excited she is, down there. I fuck harder, and harder. I can't stop fucking her ass, even as my dick touches her shit, sometimes missing it and stretching her bowels further. "Eat my cum, you fat greedy fuck pig." Slapping her butt, I cum deep inside her.

---

I'm glad he pulls out when he does. My desperation is such that if I have just one more drop inside me, I'll explode. "Ahhhhh! Fucking how..." Really hurts. Really really really. A vicious snake rushes through my rectum. I feel it force its way out, clutching onto whatever I can find. Surely this must be worse than childbirth jesus fuck, "aaaaaaahhhh fuck you!"

---

Her anus, let's call it Mount Mira, erupts with milky white cum, and bright yellow piss. All over the floor. I'm squirted with my own filthy excretions. Overcome with lust, I open my mouth wide to accept her bounty. I'm actually drinking it. Filthy fuck urine mixed with her own ass grease. I gratefully swallow it all, as it burns my throat and repulses my tongue. As I close my eyes, I don't even realise that something solid has landed inside my mouth. Not just a speck. A whole turd. "Swallow it....." She manages to say, she too taken by pure anal pleasure. I begin to chew, even as huge brown turds, shit-stained cum, and piss land on my flat chest, abdomen, and dick. The excitement drives me on. The taste is first sweet, then bitter, this filthy brown sausage half-protruding from my mouth. I have to eat it all. It's exquisitely earthy, disgustingly unhealthy, and it's going to be my dinner for today. I swallow a lump. At first it feels like I'm going to choke on it, but I force it down, despite my gag reflex. And another. I have to eat the next half of the log, and then another log, then all of it. The smell is horrid, yet it turns me on so much. I swallow the next bitter-sweet half. My mouth is filled with disgust. I am my fat, filthy, slob sister's toilet. And I think I love it. Even though my stomach is already complaining, even though I could throw up right now, I'm going to eat every last one of them. Even if it kills me, I'm going to keep them in my belly and digest them, my sister's loving logs.

~Fin~