Post Bad Ending Vore stories. Here's one I got from Aryion were this was originally made.
Story 1: Tatsumaki's Betrayal, Part 1
Tatsumaki let loose a rumbling burp, releasing the ever dwindling pocket of air of the unfortunate meal that squirmed helplessly inside of her gigantically engorged gut.
“Fubuki, mind settling down in there? You're giving your big sister *hurp*, an upset tummy.”
The once tall and beautiful leader of B-Class superheroes, known as The Blizzard of Hell, had been reduced to nothing but a hellish case of indigestion in the innards of her bigger sister, The Tornado of Terror, Tatsumaki. Now as the green haired pipsqueak carefully wobbled in the air as she lugged around her much heavier sibling, Fubuki was increasingly growing desperate trying to find a way out before she was reduced to nothing more than a layer of fat on her sister's thighs.
Tatsumaki gave a grunting hiccup as she felt her elephantine belly lurch back and forth, Fubuki trying her damnedest to use her psychokinesis in a last bit attempt to escape. She didn't want to harm her older sister, but in this situation it was either life or death. However it did not amount to much, as Tatsumaki's S class abilities were so vastly more powerful that it easily dampened the esper's damage, making it so that it felt like nothing but an annoying bout of gas.
“Unf, such a troublesome little sister you are Fubuki.” Tatsumaki said in a scolding tone. “I was right in deciding to keep you as close as possible to me. Now you won't have to worry about ever being a failure in the upper classes, now that you get to be part of the strongest S class there ever was. Though I'll have to make sure that you don't end up as too much flab. It wouldn't be fitting for my sister to make me too fat after all.”