Sterek unintentional weight gain!
This is day 4 of @fatguarddog's feedist kinktober. I find it quite hard to stick to timelines with these things so just moving through the prompt list at my own pace!
Comments appreciated and prompts welcome in my DMs
Stiles let out a groan of frustration, pushing his hands into his fleshy stomach and sucking in so that he could actually see the red flashing numbers that had been half blocked by his middle. Really, the fact that he had ballooned that much should have been an indicator of how much he had gained, and yet when the scales finally settled on a mocking 263 pounds, his mouth dropped in shock.
He pinched at his flabby belly, the pale flesh sticking out in front of him like he was 6 months pregnant, bloated even when he’d not even eaten breakfast yet. If that wasn’t bad enough, his belly had taken the form of a B, sinking in deep at his belly button before protruding back outwards even further than his top half and had begun to sag over his underwear, half covering his crotch. He stepped backwards off the scale, watching as his belly wobbled and moved independently to him. As he walked towards the bedroom he was all too aware of the fact that his thighs had backed on the pounds too, and were now rubbing so much that he had developed a slight waddle to accommodate it.
In the bedroom he forgo his jeans - they had been a nightmare to pull off the night before, an event which had led to this spontaneous weigh in - and stuffed himself into sweatpants that he chose to ignore were also feeling a bit tight around the waist. He had no substitutes, however, for his t-shirts and had to settle for a very hugging white one that cupped his fatty chest and clung to every roll around his middle. He tried his best to pull the sweatpants as high as they world go in order to roll the shirt into it but the second he moved he felt it inch upwards and expose a sliver of pale flesh,
Stiles studied himself in the mirror. Every single calorie he had stuffed into his face was evident on his body. He turned sideways, smoothing his shirt down and cupping his stomach in both hands as if it were a baby bump, and marvelled at how massive he actually was. As if reading his thoughts, two muscular arms appeared and wrapped themselves around him, resting over his own.
“Boy or girl?” Derek teased, his hands rubbing up and down Stiles’ belly soothingly.
“Fuck off,” Stiles groaned burying his head in his hands whilst Derek held his belly. “I’ve gotten fat, Derek.”
Derek hummed in agreement, moving his hands to the overhang of his stomach and holding the girthy weight of it in his hands, Stiles signed in relief as the weight was no longer dragging him down. His back had started aching a lot these past few months as his weight creeped up and Derek had figured out on his own that holding Stiles’ stomach eased the pressure. It was embarrassing but it also made Stiles feel loved.
“You’re not disagreeing,” Stiles mumbled into his hands.
Derek let go of Stiles’ stomach causing him to puff out a breath as it dropped down unexpectedly. Derek turned him in his arm, wrapping them around his shoulders and pulling him flush against him, Stiles’ boulder of a stomach pushing against Derek’s lean abdomen. “l’m not going to lie to you,” Derek ran his hands soothingly up and down his back, “you know you’ve gained some weight, what does me telling you otherwise do?”
“I’m all ugly and gross and jiggly,” Stiles muttered, trying to crowd more into Derek’s space but being stopped by his belly. “I’ve gained over 100 lbs since High School.”
“You’re my mate, Stiles, I’ll love you wherever you’re 100 pounds or 500 pounds,” Derek told him, pulling him closer and placing a kiss on his hairline. “But, I want you to be happy, so if you feel you need to lose some weight then that’s what we’ll do.”
Stiles lasted 3 days of sadly poking at salad leaves and grilled chicken, dreaming of smokey bacon burgers and a late night taco bell drive through visit and breaking out the Hale family recipe book to make those chewy peanut butter cookies before he was struck by an amazing idea. Four hours later he came through the door with a whirlwind of bags that he dumped in the kitchen before finding Derek in the living room.
“You’ve been gone a while,” he stated, opening his arm, welcoming Stiles into a hug. Stiles didn’t hesitate and dropped down onto the space, the couch groaning with the sudden added weight matching Stiles’ groan as he belly slapped against his thighs. Instinctively, Derek wrapped his arm around Stiles’ middle, his hand resting on the swollen ball. Stiles watched Derek’s hand absentmindedly rubbing circles into Stiles’ tight skin and felt a shot of excitement and warm up his spine. He wasn’t that big, was he? Maybe he was fine as he was? He had upgraded his clothes, going two sizes bigger - “They need to be bigger Derek! How do you expect me to work out in such tight clothes, I need to be comfortable!” - and now he didn’t look as big. Maybe it was the clothes fault! This train of thought was combated by the sight of his belly bulging out onto his thighs; it was that big.
“I’ve had an idea,” Stiles told Derek firmly. “Marshmallows!”
“Marshmallows?” Derek repeated, sounded confused.
“Marshmallows,” Stiles nodded in confirmation. “They basically have zero calories, Derek. That way I can still have a sweet treat whilst not eating anything fatty. I’ll be much more motivated to lose weight if I can still eat things that aren’t classed as rabbit food.”
And maybe this plan wouldn’t have been too bad of an idea if Stiles had simply stuck to a bag of marshmallows every now and then. Instead, however, he seemed to have added marshmallows to every meal, dosaging himself with far more sugar than he had consumed when he wasn’t on a diet . Marshmallow cereal for breakfast in the morning - “It’s fine Derek, it says it contains fibre” -, Marshmallow fluff slathered onto half a dozen pieces of toast for lunch - “Marshmallows hardly have any calories, Derek, so really it’s only a couple hundred calories for the bread” - an Thanksgiving style Sweet Potato casserole topped with a bag of marshmallows every evening to pair with his chicken. As if that wasn’t enough, he would constantly be snacking on candy bars filled with the sticky filling, would keep bags of them in his desk drawer to eat as he worked, and would make himself trays full of s’mores for a midnight snack.
Any concerns raised about the validity of this “diet” was met with a scoff. “I googled it - there’s on average 23 calories in a marshmallow. I could eat 100 a day and only just hit my intake requirements,” he proudly told Scott after their monthly pack meeting, conveniently ignoring that a) he ate at least 100 with his dinner last night and b) the graham crackers he had slapped them between held significant calories in their own right.
6 weeks into this new diet and Stiles seemed to be ballooning by the day. Derek was very well versed in every inch of Stiles’ body and could tell that the skin was becoming more taunt, that there was more to grab hold of at night, that his face was looking more puffy as the weeks moved on. Stiles, however, seemed none the wiser, completely ignoring that he wasn’t having to pull the drawstrings on his sweats as far anymore. Instead, he stood in front of their bathroom mirror shirtless, admiring himself from different angles.
“I think it’s starting to work, you know,” he declared, holding his belly in his hands and jiggling it. Derek watched on in amusement, having witnessed this dance many times, each time Stiles having an excuse as to why it definitely wasn’t working.
“Okay, so i’m a bit bloated at the moment, but i’ve only just eaten,” - he’d had a cookie pizza that had pepperoni shaped marshmallows on top for dessert - “but my pants still fit as good as the day i bought them!” - the pants no longer needed their drawstring to fit snugly, and had also “absolutely, definitely been shrunk in last weekend's wash.”
“You look good, babe,” Derek nodded along, getting ready for bed. “You coming?”
“Yeah, yeah, let me just get a few chocolate bars in case we get snacky,” Stiles retreated downstairs only to return 5 minutes later, puffing as he walked, the stairs taking their toll on him as he reached the top and made his way into the bedroom, his waddle becoming more prominent. He threw himself on the bed with a huff, the mattress bouncing under him and he hurried under the covers.
“You alright?” Derek asked, his hearing picking up on the fast heartbeat in his chest.
“Yeah, yeah, man,” he waved him off, resting his arms either side of him above the covers, pulling the sheets tight against his swollen middle. “Just tired, nothing to worry about.”
The rest of the pack had voiced their concerns to him about this diet, how it clearly wasn’t working and that Stiles was packing on more weight now than he ever had whilst passively gaining. Derek simply shrugged and stayed silent. Stiles was happy, he was confident and he was still as attractive to Derek as he was their first night together, what he chose to do with his body wasn’t Derek’s business. He enjoyed exploding Stiles’ body when they were in bed together, what did it matter if there was more of it to hold? All his previous relationships had been filled with sharp bones and cold bodies but with Stiles, Derek found comfort in the heavy weight resting on his chest as he slept, the warmth of his skin melting into Derek.
It took another month for all of this to come to a head. Stiles had continued to pack on the pounds as the days went on until, finally 10 weeks after the start of the infamous diet, Derek watched in amusement as he tried to pull himself out of bed after a particularly large midnight stuffing .
“Ughhhh!” Stiles puffed, having to rock himself a few times to get enough momentum to roll onto his side and drop his legs to the floor. He wrapped one arm around his stomach, that was still bloated and stuffed from last night, to hold it in place before his other arm held his weight, pushing him upwards. His arm shook underneath his frame before giving in and he collapsed backwards onto the bed.
Derek stifled a laugh and came to stand over him. Flat on his back, his mountain of a stomach swelled like a beach ball over him, pinning him to the bed. He held out both arms to Derek who pulled him to his feet effortlessly with his supernatural strength.
Once on his feet, Stiles looked down at his stomach in thought. “Maybe I should weigh myself, just to make sure i’m on track,” he sounded unsure so Derek nodded and gestured for him to lead the way. Derek could have gone first, but this allowed him to enjoy the view as Stiles waddled, his legs further apart than 3 months ago. His back was bowed slightly, pushing his stomach out further as it led the way, the bottom flabby apron section swinging as he moved.
Standing in front of the scales, Stiles took a deep breath before mounting the device, the plastic creaking underneath his pudgy toes. Derek could see the cloud that Stiles had been living in these past few months fading away, could see in his face how he could no longer convince himself that this diet was a good idea. “You’re going to have to look,”Stiles mumbled, “I'm too big.”
Derek stepped around Stiles and glanced down, excitement burning through his throat as he smiled slightly, “306.”
“WHAT!” Stiles head shot up, his eyes filled with panic, “I’ve gained almost 50 pounds!” He stepped back from the scale, sitting himself on the edge of the bathtub, staring down at his massive girth. It seemed as if most of the 50 had gone to his magnificent belly, inflating it to the point where it covered nearly half of his thighs.
Sensing it was now or never, Derek took to his knees in front of Stiles, spreading his legs apart so he could crowd into his space. He grabbed the pale skin between his hands and pressed his lips to the belly. He could feel the warmth of the tight skin against his mouth, and could hear the light gurglings below the surface.
He began peppering kisses along the flesh, punctuating his words with his lips. “Stiles you’re the most” kiss “handsome” kiss “loving” kiss “beautiful” kiss “mate I could ask for.” His fingers digged into the pudge, his thumb rubbing smooth circles into the tender flesh. He nuzzled it with his nose, feeling Stiles’ hand find his hair and begin playing with the strands.
“Derek,” Stiles began but Derek shushed him, pulling back to look him in the eyes. He pushed himself up against Stiles' middle, feeling it squish between them.
“No, just listen,” Derek insisted. Whilst his eyes looked at Stiles, his hands stayed on his stomach. “You were so small when we first met, every time there was a new threat I was convinced you were going to snap in two. You were always so cold to touch and never relaxed. Now, you feel safe, you feel warm, I can feel you next to me in my sleep, I know you’re there. You’re my mate, Stiles, and I want you to be safe and happy and secure.”
“I don’t want you to leave me,” Stiles mumbled, pulling Derek into his chest, hands still wrapped in his hair.
“Stiles, be honest - are you losing weight for yourself, or for me?” Derek asked.
Stiles was silent for a beat, his chest rising and falling against Derek’s head before he nodded. “I look at all the other people you’ve dated, and I look at you and I wonder what must people think when they see us together? And then I get sad and end up eating my feelings which starts the cycle all over again. It’s nice, not caring about whether an extra slice of pizza is going to tip me over the edge and add another pound, but it’s even nicer coming home to you every night.”
Derek stood, pulling Stiles up with him before sitting in his place. He tugged Stiles forward, allowing him to straddle his lap, immediately feeling secure feeling the weight of him pressing on his legs.
“You’re happy and you’re safe. I need to feel like my mate is safe and protected, and you are. That’s all that matters to me.” With Stiles’ arms around his neck securing him in place, he let go of his waist to hold his stomach again. It had invaded the space, pushing against Derek but being so large that it didn’t even allow Stiles and himself to be face to face. “You’re so attractive to me.”
“You into this, sourwolf?” Stiles grinned, wiggling so that his belly jiggled in Defek’s hold. Always one to lighten the mood when things got a bit too serious, Stiles threw his head back in an exaggerated sigh before declaring “well I suppose I can put my diet on hold if it means you can get off easily.” Derek rolled his eyes but grinned all the same, leaving forward to plant a kiss on Stiles’ puffy cheek. “If I had known you were this kinky I would have hit the 300 pound mark months ago!”
“I know, I know,” Stiles mumbled, resting a hand on Derek’s chest, tracing his finger up and down. “I don’t mind being bigger, like you said, I feel more sturdy and myself, more confident. If you’re okay with it then so am I.”
“I love you too,”Stiles waggled his eyebrows at Derek. “Now, you kinky bastard, how about we go explore all 300 pounds of me?”
This is also on Ao3 if you could go show it some love over there! https://archiveofourown.org/works/51231895