Kim invites Becky to a sleepover

By: Cheese111

The walls around you shuddered as your girlfriend shifted around. You were utterly helpless, lodged deep inside of her. The only ray of hope was the harness chaining you to the outside. Without it you'd be lost in her bowels forever. Or at least until she'd finally have to take a dump. You push the foul thoughts out of your mind and try to pull yourself closer to the entrance with the chain. The thick slime coating the walls makes it relatively easy to slip around, but the ongoing peristalsis effortlessly undoes any progress you make. It became bitterly clear that the only way you'd be leaving this hell was with Becky's help. And judging by her elevating heartrate, she's got other things on her mind.

"Oh, how about a sleepover." Kim suddenly suggested, Becky's eyes going wide with joy as a delighted squeal escaped her.

"Let me call my folks, I'm sure they don't mind." She adds. Your sister quickly hands your girlfriend her cellphone and one call later it was agreed. She could stick around for the night and little Willy could stay in his awesome little butt prison longer. But the two weren't doing playing. Not by a long shot. Eyeing that handsome shaft, Kim gets in close and begins to lick Becky's cock. "Oh. Oh, that's good. Keep going." She moaned, feeling herself harden swiftly, her heartrate rising.

You weren't sure what was happening, but Becky's body was twisting and turning. Up and down seemed to change at random, making your stomach lurch until finally she seems to settle down. You thank your lucky stars she stopped before you had to throw up. Encased by her body you are completely in the dark with regards to anything happening out there. You couldn't have guessed at all that your sister was currently giving Becky one hell of a blowjob.

Becky moaned louder and louder, Kim proving to be well-practiced in satisfying the full length of that thick shaft. It doesn't take long for your girlfriend to enforce the rhythm by grabbing Kim's head. She was so close, just a little bit more. Without warning she pushed herself in deep and blew her load right down Kim's gullet. She swallowed it all greedily, backing away from the saliva-slickened shaft and licking her lips. Becky smirked, holding back a laugh as your sister looked thirsty for another mouthful. But the two knew that this sort of pleasure had to be returned in kind. Kim presented her cock to Becky and your girlfriend happily swallowed Big Willy up.

Kim is taken aback by the sheer voracity of Becky. She's actively trying to suck the cum directly out of her, like an overzealous vacuum cleaner. With a gentle pat she coerces her to ease off a little before the two settle into a pleasant back and forth. Big Willy goes along with it until finally your sister hits her peak. A gooey payload is launched right down Becky's neck. She too swallows like her life depends on it. Several more rounds follow, each more arousing than the last as your sister and girlfriend seem to have descended into a bitter feud over who can pleasure the other the most. Finally they stop, laying down on the bed, exhausted.

"Oooooh, I haven't had this much fun in ages." Kim comments with the biggest smile on her face.

"Maybe little Willy is ready for another round too?" Becky joins in on the smiles.

"Let's find out, I know just how to get him out of there." Your sister's smile turns naughty, Becky nodding in approval and presenting her ass. In what must seem very odd from an outside perspective, Kim leans in and starts talking. "Listen up, little guy. If you want out, you better let Big Willy have you. Otherwise you'll have to wait under Becky's gonna do a number two. Your call."

You sigh with frustration. Neither prospect sounded particularly enticing. Letting Big Willy suck you in meant you'd be back out with these two towering psychopaths. But exiting the natural way somehow managed to elicit and even worse reaction. With little else you can do you wait for the monstrous cock to come and 'save' you. You grit your teeth, already picturing the insufferable smug grin on Kim's face as she lords over you that she rescued you with Big Willy. It didn't take long for the passage to widen, the bulbous head of your sister's cock invading to make you miserable once more. With a resigned sigh you try open the slit and squeeze yourself inside. Kim's moans are so loud even you manage to hear them, the thick member assisting your insertion by actively trying to swallow you. It doesn't take a great deal of effort to sink completely into the sweltering, throbbing head.

Foul slurps and squelches surround you as Big Willy withdraws, bringing you with him. The heavy monster has swallowed you completely, letting you out moments later. It'd been hours since you were stuffed up your girlfriend's ass and both of them looked utterly worn out. You try not to think about all the ways they've defiled eachother. It was hard to imagine Becky in a more different light than she had managed already today. Her willingness to use and **** you as nothing more than a toy were shocking, even more so when she seemed so careless with your life. But her love was strong, as a most surprising revelation was about to illustrate.

"Good news, little Willy. Your girlfriend here has managed to nag long enough for me to consider putting you back to normal size. It'll probably take all night to work, but if you drink this you might wake up tomorrow being your useless big self again." Kim sighed. But before you could breathe a sigh of relief she leaned in. "But if you try to get me in trouble for any of this, I can have you tiny, helpless and stuffed inside my cock before you can beg for mercy." Her sheer size alone made her effortlessly intimidating. You gulp and nod. Vengeance could be worked out later, for now you just wanted to be big again. To stop being a plaything for these two maniacs.

"I can't wait for this new chapter in our relationship. Oh, it's going to be so much fun." Becky crowed. Kim rolled her eyes and retrieved a small vial of crimson fluid, handing it to you.

"Drink up." She stated flatly. You couldn't get the foul liquid down your neck fast enough. You didn't care what it was or where it came from, if this gave you the five and a bit feet worth of missing height you'd take it.

"Can he sleep with us?" Becky offered, but Kim shook her head.

"Probably better if he's in his own bed. This stuff has some pretty intense side effects. Wouldn't want anything to happen to your precious boyfriend, now would we." She teased.

"Fine, but tomorrow I'm going to break in that cute little butt of yours, little Willy. Maybe a little earlier." Becky's voice was dripping with desire, making you fear the worst.

"Not earlier. I mean it when I say it could have serious consequences if you mess with him when he's still growing." Kim's voice is dead serious. Becky moped a little but seemed to understand the severity of what's happening. Your sister grabs you firmly and takes you back to your bedroom. With surprising gentleness she puts you back in your own bed, tucking you in. Your old pajamas were still there, looking enormous from your puny perspective. "Heh, you'll grow back into them." She chuckled, putting the garments aside for now. "Good night, little Willy." She waves and closes the door.