Made by Songbird567 on Deviantart, posted with his permission, with slight edits by me.
Issei chuckled nervously and tugged at the ropes that bound his wrists to the bedpost. "Y'know Asia, if you wanted to have a day all to yourself then you could have just told me. No need for the ropes or anything." He murmured and looked across the room at the girl in question. It had been a week or so since she had surprised him along with Rias and Akeno, the group gorging on cake and smothering him rather fiercely. Issei's face contorted into a dumb smirk as he was treated with the mental fantasy in the form of his memories. After violently shaking his head, Issei was returned to the present and looked back at Asia.
Well, he never looked away. His eyes were glued to her gargantuan ass while his mind was occupied with his fantasy. Issei had woken up tied to the bed in his room while Asia had been naked at a nearby table, her back facing him, along with her ass, which was clearly the largest of all three girls.
When he actually observed the curvature of her cheeks he was able to make out that they were indeed bigger. Asia must have really been gorging over the past week because she looked notably larger all over. Just her butt, which had previously been BLESSED with adorably thick, amazingly round, and fantastically fat beach ball sized cheeks was now rocking a set of yoga ball sized, couch crushing, dream fulfilling mounds of fat. Looking down from the cheeks treated him to a rear view of her thighs which were so thick they not only brushed together but also forced her to adopt a wider stance as they pushed off of one another, never to be separated again. Her calves were just barely thinner and led to a rather cute set of cankles. Issei distinctly remembered that was where Asia was at her most ticklish. He had her almost crying with laughter just from tickling them, truly an adorable sight that warmed his heart.
Above her wide hips were thick rolls of back fat, too big to properly grip in one hand. Even from a view of her back Issei could see the sides of Asia's gut and assumed it was stuffed from whatever food was on the table. If the bound boy were to guess then Asia's belly probably hung down to where it was just above her knees and maintained a smooth, rounded shape. Her breasts were most likely hefty and substantial when compared to her formally petite set but still paled in comparison to the other girls. Issei still believed that one day Asia would get the big chest she deserved though.
"Asia? Helloooo?" Issei asked, the girl not hearing his earlier call. This time however she spun on her heels and revealed her face was moderately dabbed with various colors of frosting. The sudden turn caused her belly to swing to the left, while her plush posterior went right, her ever growing buns slapping with loud CLAP.
Fatty physics truly was amazing. Issei's smirk returned only far wider as he saw Asia's bare chest and plush belly. If he weren't bound to the bed he would have rushed over and wrapped the girl in a big, tight hug.
"Oh Issei, you're awake!" Asia exclaimed and quickly cleaned her face and dusted some crumbs off of her belly, though some went into her rolls instead. She looked at the floor for a few moments and twiddled her fat little fingers while muttering under her breath. Eventually, Asia took a deep breath and gained a confident expression. "Akeno gave me some tips to be assertive! I'm not going to be pushed away by the other girls anymore!" She exclaimed in a rather serious and determined tone only to come off as adorable. "So I'm gonna eat this and I want you to watch me."
"...Ok," Issei replied after a momentary pause. It was kinda shocking to see Asia act like this. It was super cute so of course, Issei didn't mind, but he was still surprised.
Asia waddled to the other side of the table so that Issei would be able to watch her stuff herself. She scooped up syrup-drenched pancakes and crammed them into her cheeks, easily gulping them down one after the other. Her eyes had glared with a serious fire but it quickly fizzled out as the sweet flavor overwhelmed her. Try as she must, Asia still wasn't too good at being the serious assertive type. She stuffed her face, gulping down the towering stack of pancakes with glee. Every now and again she "accidentally," dropped one, the flapjack flopping onto her chest, a thin trail of syrup falling into her budding cleavage.
"O-oops..." She murmured and winked at Issei before she grabbed and quickly swallowed the fluffy pancake. "Uuuurp, excuse me." She pardoned herself and giggled before resuming her stuffing.
The formerly pious and well-mannered girl quickly tore through the immense breakfast on her table like a starving man, well, woman. Stuffing butter and jelly soaked toast down her gullet, eating bacon by the fistful, slurping down scrambled eggs that were buried in cheese, and gleefully scarfing down cinnamon rolls that were practically made with frosting. She felt as if she was in her own personal Heaven and the fact that Issei watched every second had her even more ecstatic. With this energy pushing her she was able to finish her meal very quickly, her belly swollen outward slightly more than usual as it was packed with food.
She stifled another burp with her hand and slowly waddled around the table. "Now that that's done you sit right there Issei. No one is going to interrupt us today." She stated and approached Issei.
"Ooh, that's alright with me!" Issei exclaimed, his giddiness evident by how he shook about on the bed. He watched how Asia jiggled and wobbled with her every step. As one foot touched the ground it caused a jiggling effect to spread up her legs. Her hips bounced, her butt cheeks clapped loudly, her lovehandles wobbled, her belly swayed, and her breasts shook. It was a wonderful sight and he drank in every second.
Asia did a little twirl to give Issei a view of her doughy ass, but she failed to notice a wooden dresser which was instantly smashed into pieces when her cheeks collided with it like a pair of fleshy wrecking balls, the various splinters unable to pierce or harm her heavenly blessed bum. While Asia was plump and soft from head to toe she still weighed over six hundred pounds and growing! That weight had the potential to cause serious damage to furniture. The impact also threw her balance out of whack and she tripped over her own feet. Now stumbling forward, her butt lurching up her back slightly, the two briefly made eye contact before they collided. "Owie...Issei are you ok? Issei?"
Issei was unable to answer as his face was stuffed between Asia's breasts, but he did mouth a reply of, "Never better!" With all sound being muffled by her ample cleavage.
"Good...but you know...I was really upset when you didn't feed me any cake last week." Asia pouted and grunted with slight effort as she shifted her heavy body. Despite her immense devilish strength, along with Rias and Akeno, the trio were still getting used to carrying their ever increasing weight, though that problem was quickly vanishing. It's almost as if when their weight climbed higher and their bodies got fatter, their strength increased along with and then some, leaving them stronger than they've ever been.
She had to roll onto her side and slowly got into a seated position. Just this had the poor girl slightly winded and left her with hardly enough strength, though that was quickly returning. All she could manage to do now was slowly inch herself backward so the center of her booty buried Issei's face, while a decent amount of her hips flowed over the side of his bed."Huff...huff... made it...phew one second." Asia panted and wiped some sweat from her brow. "Where was I? Oh yes, to make it up to me I'm going to sit right here! So get comfy because I won't move for a...wait what's that noise?"
The noise in question was a squeak that gradually grew into a groan. A few seconds later the wooden supports for the bed were crushed and the mattress dropped a full foot to the ground. Asia was once more treated to her own body's involuntary wobbles, a moan escaping her lips as the sensitive mass quivered like pudding. Then there was the fact she felt something firm press against the bottom of her belly. Asia blushed as red as a tomato and nervously squeezed her belly, the action causing it to audibly gurgle as it started digesting its breakfast feast. "O-oh Issei...I guess we can go ahead and do that now."
Issei was still smiling from beneath Asia. 'I think I like assertive Asia~' He cooed within his head as he used the little mobility in his buried body to squeeze Asia's gargantuan ass, his hands sinking DEEP into the fat, making her moan in pleasure as she shook her body side to side, readying itself for the pleasure they were about to partake in.