Becky wants to sit on you

By: Cheese111

"Awww, he looks all tuckered out." Becky cooed, her words dripping with malice.

"He's just so puny and weak. Even our cum is a challenge for him." Kim added on, stifling a giggle. She wasn't wrong though, the cooling slime was thick and sticky, impeding even your most basic movement. It took several minutes of shameful struggle to get out of the large spray of cum staining the mattress. All the while Kim and Becky laughed and offered insincere encouragement. You were blushing bright red, humiliation stinging deep. But when you were clear, a new thought popped up.

"What should we do with him next?" Kim mused. Becky looked down at you and grabbed her cock, slowly stroking it. Ever since you two were an item she's been daydreaming about sticking it in you, but at your current size it'd probably just feel awkward. Perhaps she could offer you a different kind of intimacy.

"Do you think he can handle being sat on?" She asked Kim. Your sister pondered it for a moment before giving a nonchalant shrug.

"Probably, you were able to fuck him into a pillow without any apparent damage done. I can't imagine this would be too much more to handle. And oh my god..." She pointed down at you and Becky looked closer. The horrid musky stench had stirred your manhood into action. Your heart sank, fearing this bout of arousal had just signed your **** warrant. Becky was quick to turn around and present her huge ass to you. On any other day it would look like a slice of pure heaven, but right now it looked like impending doom as it filled your view. You try to run, but Becky barely needs to adjust herself to catch you underneath one of the enormous cheeks.

As the soft mass bumps into your head you stumble and fall, finding just enough time to roll onto your back and hold out your arms in a futile effort to stop the inevitable. With a tiny slap the smooth skin makes contact, moulding around you and pressing down hard. It felt like nothing short of a miracle that you were alive at all. You'd feared this was going to be a quick and violent ****. But perhaps there was something about Kim's statement before. Becky's pounding was painful, but not unmanageable. This almost seemed easier to deal with, the pressure spread out over a larger surface. What you couldn't see was Becky bracing herself against the side of the bed to not overwhelm her tiny boyfriend all at once.

The moment she let herself fully sit down she felt the mattress yield beneath her. And packed in there was a little pocket of extra resistance. Barely able to squirm beneath her and all the more arousing for it. She sat at full mast, rubbing her cock as she slowly shifted her rear from side to side.

The smooth wall of ass that pinned you down slid back and forth, grinding you softly as it crushed you into the mattress. It could only give so much before your body was next on the line to soak up the stress. It hurt like you couldn't believe. Not just physically either. To be used so callously by your own girlfriend stung. To have that beautiful ass be your tormentor was a betrayal as strange as it was painful. Your sister being to source of all this horror was just the cherry on top of this humiliation sundae.

"Does he feel good?" Kim inquired, curious to hear the verdict from your girlfriend.

"He's barely even moving. But it feels great all the same." Becky replies, seeming a little surprised. She chastise you for being lazy, but she was enjoying her seat plenty as is.

"Maybe we can make it better..." Kim mused, smiling as she saw Becky's eyebrow lift with curiosity.