Matt knew he had to stop. The foot that he was massaging was swelling in fits and spurts, and it was speeding up. It had grown to the size of a manhole cover by the time he had ceased his efforts. It was obvious that she grew in time with her pleasure, and that he was only helping to fuel that. She was growing closer to orgasm, and Matt didn't want to see what that would mean.
Or did he? His girlfriend, still higher than a kite, was growing into a busty, curvaceous behemoth right before his eyes, and his penis, now touching part of Ashley's right sole, was hot and throbbing. She had to be at least eight feet tall by now, and her big, round, sexy butt had swelled and grown to even more exaggerated proportions. Did she even realize what was going on, how much she had grown?
A loud rip echoed over the increasingly frantic moans of Ashley. The crotch of her pants had blown out, unable to take the strain from her enormous thighs and hips. Ashley's eyes opened slowly "Oops," she said, giggling. "Looks like I'm . . . mmm . . . too big for my britches, huh Matty?"
Matt only grunted as he stared at the tear which quickly grew under Ashley's movements. He saw flashes of wet, pink silk through it. God, Matt thought, she's growing out of control . . . and I think she likes it.
Ashley sat up slightly on her elbows, taking a break from her still-expanding chest, which had turned her tank-top into a flimsy, disintegrating sports bra, and peeked at Matt. "Honey . . . why'd you stop?" Ashley pouted. "I thought we were having fun."
Matt gulped. Had it just been his eyes, or had she grown a little at the word, 'fun'? "Shuh-sure, Ashley, fun. It's just that--isn't it a bit--I mean, are you sure it's safe to be growing this much?" He tried to lean back a bit, trying to get his dick off of her foot so that she wouldn't notice the raging hard-on in his pants.
Ashley at up all the way and looked down at herself, at her sweaty, tattered, straining clothing and grinned sheepishly. "Come on," she said, "I've only grown a little bit bigger. Besides, I can't help it. The drug, that growth drug, it made me all horny." Ashley murmured and shut her eyes briefly, and her nipples, already the size of two bottlecaps, jutted outward and swelled to the size of thumbs. "Oh god," she groaned. "See what I mean? Just thinking about it makes me swell up. It just feels sooo good to touch myself. And it feels even better when you're rubbing my big feet. Or . . ." Ashley stretched her foot, the size of Matt's torso, into his crotch. "When my big feet rub you."
Matt shuddered and twitched. By reflex, he folded inward, hugging her big, sweaty feet, her toes bigger than softballs. Ashley gasped and moaned at the sudden attention. Her foot undulated outward and upward, rubbing up against Matt's dick through his jeans. The foot grew bigger, stronger, heavier against him, and Ashley panted deeply.
Ashley felt it was time. Her hands, with palms bigger than Matt's whole head, traveled past her breasts to her pussy. She started out rubbing her inner thighs, mushing and massaging them, ripping further the frayed fabric that used to be her pants. "Ooooh, Matt, know what?" Ashley asked, still rubbing her foot over Matt's throbbing penis. "I think this shirt might be a little too small for me now, don't you think? You know," she said, pressing and squeezing her mons above the fabric, lightly touching her pussy lips through the hole in her pants, "big girls like me need big clothing to grow into, see? And this tiny shirt is so small, I don't even think I can get it over my breasts! Oh, and it feels like it's getting even smaller. It's rubbing against my nipples, Matt."
Sure enough, Ashley's nipples were pulsating, struggling against the tearing cotton fabric. "I'm getting bigger, Matty. My boobs and my feet and my butt, they're all getting bigger, and it feels sooooo good!" With that, Ashley began masturbating, rubbing and rotating her crotch faster and faster.
Matt couldn't hold it after that. Ashley had sped up her footjob, too, and with a strangled moan, Matt blew what felt like a gallon of come into his boxers.
Ashley, however, seemed to forget about Matt altogether, and began thrusting her hips toward the air. On the receiving end of one such thrust, Matt hung onto Ashley's titanic, growing, man-sized foot as it slid back and forth slightly on the concrete floor.
"Ooh, I can feel it! I'm almost there! I'm growing, look at me getting bigger, Matty! I wanna be even bigger! BIGGER!" As Ashley came, her flesh billowed out, violently bursting her remaining tatters of clothing, her pink panties snapping away. Matt was flung against a wall and collapsed in an unconscious heap. Similarly, Ashley, exhausted from her session, drifted to sleep.