Becky's orgasm causes her to grow again

By: Cheese111

Becky murmured something to herself, pleased by the results of her actions. Seeing the pathetic boy on the floor with a belly swollen with her cum added wonderfully to the warm feeling of the afterglow. But if they thought that was enough to empty her balls she was ready to spring an awesome surprise on them. Before she could deliver the good news a strange feeling overwhelmed her. It felt like her skin was tightening, making her wince in discomfort. Kim took notice and stared in awe as she watched Becky gain another two feet in height. It took mere seconds and stopped as fast as it had started.

You felt the inescapable rush of pleasure going through your sister as Big Willy twitched excitedly within you. Fear seized your heart as you watched your girlfriend grow.

"Well, isn't that interesting..." She looked down at the boys, now a little punier than before. Becky then turned her attention to Kim. "Do you think this is because of me blowing my load into him?" She gestures vaguely at Blake and Kim ponders the circumstances for a moment.

"It's possible, but I reckon that's a theory that needs... testing." Her face curled up into a cruel smile.

None of your friends seemed to realize the danger that they were in. They meekly looked up to Becky as she mumbled a short rhyme trying to pick out her next victim. Anthony was chosen and Becky's orders were as simple as they were gutwrenchingly awful. "I'm still horny, suck my dick."

Anthony stood before the throbbing cock, steadying it with both hands. It had gotten thicker and taller, making it seem nearly impossible to even put the tip in his mouth. But the heavy scent of sex and musk radiating off your girlfriend had his brain locked into just a single action. He opened wide and with visible difficulty pushed the bulbous cockhead inside. Becky tried her best to let him work it on his own, but soon his puny efforts got on her nerves. Her hands wrapped around his head and with a muffled grunt she **** herself in further than he'd ever thought possible. You shudder as you watch his body twitch and flail, a mere plaything to Becky's strength. She didn't leave him waiting for too long.

"Aaaaaahh..." She let out a loud sigh of relief as you watched her cock shake with uncontrollable release. Not a drop was spilled as Anthony's stomach was flooded with cum. The intense climax filled him to the brim, his body barely able to contain it. With a wet squelch Becky pops him free from her dick, letting another one of your friends fall to the floor. He seemed to be stuck between pain and delight, a wide smile on his face but holding onto his achingly swollen gut.

The next growth spurt was as quick and intense as the last one, adding another two feet to your already oversized girlfriend. Kim nodded along, happy to see the results of her experiment. The tent you were in was built for far taller people, so there was still plenty of room left. That said, a question bubbled to the forefront of your sister's mind.

"I wonder... Is it just oral sex that causes the increase in size..." She mused aloud, Becky picking up on the suggestion with gusto. She didn't bother selecting a specific friend, just grabbing Keith and lifting him up before her. He didn't struggle, he barely even squirmed as she blew him a kiss. Becky took a seat on an oversized chair, giving your friend a broad smile. Slowly she lowered him down, preparing to impale him on that obscene column between her legs. It stood up straight, longer than his whole torso. When it pushed against his butt you were certain your girlfriend was about to ram herself in to the hilt. But to your surprise she showed a measure of restraint. As much as he was eager to take it, Keith began to squirm and struggle as the girthy tip pressed against his asshole.

The leftover cum still dripping from her cock from last time would do for lubrication. Becky lowered him down just a bit. Not even half of her tip would fit inside. Anything more and this would get grisly. "Oh my god, you're so tight." She moaned, pushing him down just a tiny bit further. With her victim at breaking point she began to imagine what might come next. The mere thought of what she still had in store was enough to coax another orgasm out of your girlfriend. Keith whimpered as his bowels were given a thorough rinsing, the torrent of cum racing through him. It was the most disturbing and arousing thing he'd felt in his life.

You watch in horror as his body twitches. Yet another friend of yours was being used like a discount condom, filled with cum and discarded. The moment she finished her climax Becky lifted his shivering body and laid it down beside her. A little bit of her release slowly leaked from Keith's abused ass. For a few hopeful seconds you thought she'd stay as tall as she was. But those hopes were dashed as another spurt brought her up to a towering height of 18 feet. Your girlfriend now stood three times taller than you. And that lustful look in her eye was starting to get downright scary.