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"Please..." He begged, voice quivering and weak.

She grinned as the last bounce against his hips left her head scraping against the ceiling. The bed had long since collapsed under her newly increased weight. She lifted herself up, knocking the light above their bed from its fixture.

"Not yet..." She said, grinning as she held her massive chest with one hand. "We're not stopping until I'm bigger than the house."

Her hands went back to his shoulders, not that she needed to hold him down, her thighs alone had grown to be larger than his whole body, her hips eclipsed his whole body, and even if he hadn't already been ridden to exhaustion, her ass was an immovable weight that offered much needed cushioning as she rode him.

"But I'll tell you what..." She said, wiggling her hips and grinding his dick into her just a little more. "If you can give me two more loads before passing out, we can take a break for food and hydration. Deal?"

He groaned as she laughed and began to bounce on his body again. What remained of the mattress squeaked in protest as he couldn't resist spurting inside her again, just before unconsciousness washed over him.

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Credit to u/AndBiggerAndBigger for the photo!