Kyoya knew he was something of a glutton. While not as food orientated as a certain commoner, if something was tasty, he wanted a lot of it; even if it wasn't particularly the high quality, freshly made food that came from the best restaurants. Fries were delicious, he'd found while trying to eat enough so that he didn't waste away into nothing, barely having time for proper meals. He liked them soft and fluffy, but crispy and salty was also good.

Of course, his increased appetite while he was an adolescent was normal, especially with how often meals were forgotten and left to go cold. He was thin as some of the models Hikaru and Kaoru styled, their mother tutting that – while attractive – Kaoru certainly wasn't feeding him enough. Of course, when they moved in together, the other boy decided that he was definitely going to make him eat enough. More that enough, in fact. Dishes were overflowing with steamed vegetables, fine cuts of meat that were roasted to perfection, and some sort of desert or pastry that just melted on his tongue – not too sweet, and far too addictive.

All in all, with lunches that mainly consisted of fast food and dinners that only seemed to get bigger, he knew his waistline would be affected. He'd be foolish to miss it, the sharp indent his waistband started making, his hips and thighs widening. He wasn't cold as much anymore, and the pain that had always seemed to plague his knees all but disappeared, and he was oddly enthralled by the softness he was gaining. He was getting chubby, no denying it, and the clothes weren't helping much.

Before his gluttony seemed to catch up to him, he'd been a small, and that was only really because of his height. Tailors would say about how his measurements were too small – quietly, discreetly, staring at the two pairs or lower ribs that peeked out from his skin – especially for such a tall boy. However, he never really cared. Now, his sister was eyeing the strain his shirt was under and saying about how healthy he looked – although he really should get some new clothes, even if he was busy.

Of course, he had. New business suits and formal wear. He hadn't got around to getting anything casual, and so he was left to lounge around in unbuttoned jeans and overly stretched t-shirts. He was fine with that, really, and his sweatpants still fit – sort of. The only issue was that he noticed he was still getting… plusher. If anything, Kaoru was only piling his plate higher, a blush staining his cheeks, and Kyoya felt like a complete slob with a strip of his belly laying exposed, the band of his sweatpants only fitting if he let his belly hang over the top.

Of course, he figured out why Kaoru seemed to be so intent on feeding him, of seeing his clothes get smaller and smaller, and it was rather fun to tease him. When he had the realisation that Kaoru was just being a kinky little shit – not that kink was new in their relationship at all – he felt… oddly confident. At least around the house. The tight fit of his clothes were oddly thrilling, wondering if he'd still fit into them that time next week, or if he'd have to ask his beloved boyfriend to go out and get him something bigger.

He wasn't actively gaining weight. Being the CEO of a company majorly centred around healthcare brought with it plenty of expectations of how one should present themselves, and obesity was an epidemic that shouldn't be added to. It didn't really matter that he actually had less health issues now that he wasn't underweight, because people can't glean someone's medical history from a single look.

However, as long as he didn't get too heavy, then this was fine. A little overweight, and he could play it off. Chub wasn't bad, it was a natural insulator and helped protect the organs, and a little more of it just spoke to an abundance of lunch and dinner meetings – even if that wasn't the case. He was around one hundred and eighty pounds as it was, pushing him a little into the overweight category, but it wouldn't be so bad to gain some more.

That was when he told Kaoru that he knew about his little kink, saying that it was fine by him and going as far as to pop the button of his old jeans. They also talked about it after that, obviously, exploring what sort of boundaries were going to be put up.

"I like you pudgy, it's really cute and your tummy's so soft and warm," Kaoru had explained, blushing all the way, "But… I don't know how far this goes for you, and like… I don't want you to be obese or anything. I mean, if you were, I'd still love you and I'd still find you hot! I just…"

"Don't worry, I know what you mean," He assured, chuckling at Kaoru's flustered expression, "I'm not interested in gaining that much either. I… am surprisingly interested in this, but only to a point. A few more pounds intentionally, perhaps, but nothing drastic."

Two hundred pounds. That was about the limit - even if Kaoru was actually okay with more, Kyoya wasn't. He'd be in the middle of overweight, fairly portly, and that was enough for him.

Snacking when he could became part of his routine, although it wasn't particularly calorie laden. Biscuits with milky tea, crackers and cheese, anything he really fancied. After all, it was an excuse to let moderation go for a little while, and it seemed his appetite had only grown with the inches added to his soft gut. In fact, when he sat down, he noticed the odd sensation of his belly resting on his thighs. Only slightly, but he had an inappropriate erection for about twenty minutes until he excused himself to the bathroom to deal with the issue, praying that no one came in.

When he'd told Kaoru, the shame he'd felt at the time seemed to melt, and Kaoru seemed to be looking at him in near awe. Especially when Kyoya told him that he had to lift his belly up a little to masturbate.

"That's so hot," He breathed, "You're so… so gorgeous, holy shit…"

He was pushed back on the bed, chuckling slightly as Kaoru kissed his chubby cheeks, his neck, feeling up his belly and equally plush backside. He had a muffin top, and love handles, and Kaoru worshiped every single roll that had started to form.

"Stay here," He murmured, trying to claw back his composure so he didn't fuck Kyoya into the mattress right then and there, "I want to get you something. Be back soon."

The last thing Kyoya expected in Kaoru's hands were a scale and a measuring tape, but there they were. Kyoya's full cheeks were hot, turning crimson, and Kaoru stood there, nervously clasping his hands.

"I want to see how big you are…"

A/N: This'll be continued next chapter. I wonder how big Kyo is ;) If anyone wants to give me a prompt for this, please comment! I'd love to do some more with this!