Carrie reveals how she's able to grow bigger

"So transform like, my body, right?" Carrie asked.

"Yeah," you say, unsure of how to tell her. Best to just bite the bullet and say it.

"Like you, maybe...growing bigger," you said.

"Bigger eh?" she repeats, with you looking down, slightly ashamed at admitting your fetish. When you finally brought your eyes up to meet hers, Carrie didn't seem to be judging you. If anything, she looked oddly relieved. She ran her hand over your face, planting a gentle kiss on your lips before pulling back.

"Oh that is PERFECT!" she yelled out, jumping up and down a bit.

"What's the only thing I said I hated and wasn't into at all, no matter what?"

It took a few seconds of thinking back to come up with your first guess.

"Watching Dr. Who?" you said.

"Not that dummy!" she said, a playful slap on your arm as she laughed.

"You said you hated to swallow cum," you said, the real answer causing your already half erect cock to twitch at the idea of your girlfriend taking a massive load of cum down her throat.

"Right. And now, well..." Carrie trailed off, sliding from the bed and kneeling on the floor.

"I think it's time I tell you something fun right before you unload those balls in my mouth," she said.

"I grow when I eat cum," Carrie said, giving your cock a long lick from your swollen balls up to the head of your now rock hard cock. She took the head of your cock into her mouth, looking up at you as she worked more of you into her mouth.

"What?" was all you could manage to say as she bobbed up and down on the head of your dick.

"I used to be five feet tall and couldn't fill a B cup, first boyfriend in high school came down my throat and suddenly I was 5'1 and was overflowing my bra. Little bit later, different guy, and I gained two inches and was moving up to a 32D."

Whether Carrie was just playing along with your fetish and making this up or not, it didn't matter. It was having the intended effect, with your cock eager to explode.

"Tried one last time with my ex, he didn't cum much when he'd orgasm so I figured it might be safer to test out. Grew an inch and filled out a bit, nothing too bad. That was when I knew it was definitely cum. Don't know how or why, but every drop of cum I drink makes me grow."

Between what she was talking about and her playing with your cock, you were ready to explode.

"Ready to make me grow?" she asked, and you could barely warn her in time that you were going to cum. Her lips wrapped around the head of your cock, one hand rubbing your balls as if she was trying to coax out every drop of cum possible. Your head rolling back and your cock throbbing as Carrie gleefully swallowed down your thick load of cum.

"Mmmmm," Carrie said as she licked her lips and stood up in front of you.

"Fuck it feels good to grow," she said.

"Stand up," she said, reaching her hands out and dragging you to your feet. As you did, you looked down at your 5'4 girlfriend, and your jaw dropped.

You saw her begin to rise up, slowly. Little by little, taller and taller. You looked down to make sure she wasn't just messing with you, standing on her tippy toes or something.

Her feet were flat on the floor, but it was unmistakable. She was getting bigger.

"You're...you're for real?" you asked. Carrie's knowing smirk got just a little bigger.

"Measuring tape?" she asked, glancing around the room. After a bit of scrambling, you found one, returning to Carrie as she stood with a massive grin on her face.

"Measure your growing girlfriend," she commanded playfully. You did as ordered, crouching down to place the end at her feet. You put the end of the measuring tape under your girlfriend's pinky toe, looking up at her from the floor for a brief second before standing back up. The tape extending as you brought it to the top of her head.

"You're...fuck babe you're 5'7! You grew three inches!?" you blurted out. Carrie just smiled, taking a step back and walking over to the mirror to look herself over. The rest of her body had grown in kind, her ass swelling out just a bit, her tits filling out more, and it was truly official.

Carrie had actually grown.

(The continuation of this story thread has been moved to my own story here that focuses on growth and size play under the option of "Eric with a girlfriend who reveals she can grow by swallowing cum -https://chyoa.com/chapter/Introduction.848589).