This was pretty random and freestyled. I didn't really have a plan for what was gonna happen, I just started writing and rolled with it. I wanted to draw a pic to go along with it, but that'll probably have to wait until I finish commissions.

Sorry if there are any grammatical errors, I'm too lazy to read back through my work and check for them. (Also, I fixed a couple things in the version below that didn't get fixed in the file version) I hope you enjoy!

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Today I woke up with a mouth on the end of my tail. I don't know how or why it got there, but I didn't care how- soon, all I would want was to be rid of it.
"Good morning sunshine!" It sung happily.
I jumped, startled by its- his?- voice. "You can talk?" I squeaked.
"Sure can, my lady!" He chirped. "Now hows about breakfast?"
"Wait, but how did this happen? How are you here? On my tail?!"
"BREAKFAST!!" He impatiently screamed. Maybe he would cooperate if I gave him what he wanted.
I slid out of bed and trudged out to the kitchen. I lazily opened a cupboard to check its contents. Nothing that I felt like eating was inside, so I began to shut the door, only to be stopped by my tail, which had thrown itself into the door on its own. He quickly began ripping open boxes with his teeth and devouring the contents.
"H-hey! What are you doing?!" I yelled, trying to pull away. Unfortunately for me, he seemed to be much stronger than I was, making it impossible for me to get his head, or rather the end of my tail, out of the cupboard.
"Eating breakfast!" He laughed between gulps.
I suddenly noticed an odd sensation. I could feel the food he ate being swallowed down my tail and into my stomach. I can't say the feeling was pleasant, but it wasn't painful or anything either. And come to think of it, I was awfully hungry. "Fine," I sighed "Eat whatever you want, it's not like I can taste it." In response, he dug into the food more ravenously than before, chowing it down into my insides. He was surprisingly mobile in the fact that he could jerk me to the side to open cupboards and open the food's packaging on his own. I huffed and let him have his way, hoping it would be over soon. And it probably would- I was already starting to feel pretty full.
"How much have you eaten?" I said, a bit concerned at the feeling as if I had just eaten a Thanksgiving meal. I turned and looked at the cupboards to find that he had just finished completely clearing out the first, and was halfway done munching through the next. "Hey, stop! That's enough! I'm already full, and I payed for that food!"
"I don't feel full." He paused to complain. "I can't feel your body or your stomach. Only your tail, and this- this uncontrollable hunger!" And with that he ripped into a bag of cereal and swallowed the contents in one gulp. I felt the crunchy bits slide down and up into my middle all at once, struggling to fit in among all of the already present food. I belched, temporarily relieving some tightness in my stomach, but the space was quickly replaced with more food being swallowed. I put a hand to my belly- it was incredibly firm, and pressing outward against my skin. In fact, it was starting to bulge. I started to realize how serious the situation was. My own tail was piling pounds of food into me, and I had no way to stop it.
Once he had finished the second cupboard, he dropped down to the ones under the counter and began popping open cans and downing whatever was inside. I sat down and moaned as my belly gave in to the pressure and bulged outward against my shirt and buttoned jeans.
"Stop..." I moaned, clinging to my expanding tummy.
"I can't." He hissed as he gulped down several cans of corn. "My hunger is only getting stronger!" He roared as he ripped into a large can of applesauce.
"Uuuughhh..." I winced as my middle started to peek out from under my shirt, slowly dripping over my pants.
He only seemed to be eating faster and faster, causing my gut to equally gain speed in its growth . I finally sighed and unbuttoned my jeans, allowing the wobbling furry mass to spill out onto the cold floor. It looked severely pregnant at this point, but it was much softer and flabbier than that of a pregnant belly.
"That's enough! Look how big you've already made me!"
He stopped eating, and my hopes lifted. But he had only stopped because there was nothing in the cupboards left to eat. A large tongue slipped out from between his jaws and hungrily wiped his lips. "More..." He murmured. "I need more..." He turned his head in the direction of the fridge.
"Ha!" I called out. "Now you have to stop, you can't get over there without me walking there."
"Oh can't I?" He grinned. Quickly he lunged forwards, pulling me along behind him. The physics of it didn't make sense to me at all- but neither did the fact that a sentient mouth had appeared on my tail over night. I dug my claws into the floor in an attempt to stop him, but it was no good. All I could hope for now was that my poor midsection would hold until he had cleared the kitchen, and thankfully only the fridge was left.
He pulled open the refrigerator door and bit into a milk jug without hesitation. I gritted my teeth and held onto my beach ball of a gut, which began to push itself over my arms as the liquid poured into it. He moved on to leftover mashed potatoes, followed by the leftover cake, followed by an entire bag of apples. He proceeded to down a gallon of juice, a whole package of butter, the small containers of sour cream and whipped cream, and a wide array of salad dressings and sauces. It didn't take him long to finish everything in the fridge and move to the freezer, where he gulped through a gallon of icecream and crunched through several packages of frozen dinners and miscellaneous items. During all of this gluttonous feasting, I kept quiet, focusing on coping with the massive expanding ball of flesh which had now grown to be large enough to fit a whole person inside with room to spare.
"Finally." I panted. "There's nothing left for you to eat. Plus," I patted my gut "I'm probably too heavy for you to drag around anymore."
"But-" He complained. "I'm so... so hungry. I can't live like this!" He yelled. "I have to eat SOMETHING!!" He strained and managed to slide me along the floor, rechecking each nook and cranny of every cabinet and drawer, but finding nothing. "I just need to eat something... ANYTHING!" He huffed and looked around the room, eventually locking his non-existent eyes onto the sink.
"Oh no..." I whimpered.
"Oh yes. I can never run out of tap water to drink!!" He maniacally laughed and dragged me back across the floor, turning on the tap at full blast and gulping down the water as it sprayed out, careful not to miss a single drop.
I groaned and rolled forward to lay atop my massive belly, allowing it to prop me up above the ground. This was going to be a long day. I closed my eyes and finally allowed myself to consider the surprisingly soothing feeling of laying on a massive mound of fleshy mass. The pressure of the tightly packed food pressing out against my sides and front could actually be comforting if I thought of it that way, and the cool water pouring in was very refreshing. I pressed my head into the squishy flab and relaxed, allowing my eyes to close as I slowly drifted into slumber.

When I awoke, the first thing I noticed was that I no longer felt anything moving into my stomach. I swished my tail to the side and found that I had full control of it, and felt no mouth on the end. Maybe that was all a dream! It was certainly crazy enough to be one. But then I noticed another thing... if I was in bed, my bed had somehow become a lot... sloshier, like a water bed. Dangit, it was water. Not water inside of a mattress, but water inside of my own wobbling gut. I lifted my head up to observe how massive I had grown, but that was quickly answered when my head hit the ceiling. This meant that I was somewhere around 8 feet in the air, resting on nothing but my stomach, and as I tried to adjust myself, the ripples that were sent jiggling through my belly informed me that my sides were touching the walls. I lowered my head in defeat. I probably wouldn't be moving for days... At least I wouldn't have to worry about running out of food and water.