Carrie figures out she can choose what parts of her body to grow

The realization of what was happening was still setting in for you. Sitting naked on your bed, thinking about things and still recovering from your orgasm. This was a lot to take in after all, your own girlfriend able to grow like this, but Carrie wasn't interested in waiting.

"I wanna try something and I need more cum," she said, and she licked her lips in anticipation. Standing naked in front of the bed and gazing down at you, she looked like a lion about to devour it's meal as she pushed you back onto the bed and straddled you. Carrie's lips met yours as she worked to get you hard again. Her body pressed against yours just a tiny bit more as your hands roamed her body, everything about her now slightly bigger. Her ass filling your hands just a little more, her breasts just a bit more full against your chest, her muscles just a bit thicker and able to push you down a tiny bit more.

It didn't take long for you to grow hard again, with Carrie quick to reach a hand down and guide you into her waiting pussy.

"Mmm, still feels good," she said under her breath as she began to bounce up and down. She seemed to have boundless energy as she rode you, her moans filling the room as she did all that she could to get you to cum as quickly as she was able. Your orgasm built fast, and try as you might to hold it back and delay things, the point of no return was coming up fast.

"Gonna cum soon," you manage to say. Carrie slips off of you and moves down to the floor, her lips wrapping around the tip of your cock, her left hand gently massaging your balls as her right was stroking up and down on the base of your dick. You felt your orgasm slam into you as you looked down at your girlfriend, eager and excited for your cum.

As you let loose and exploded inside her mouth, Carrie looked like she was supremely focused, which was quite rare for her. Eyes closed, her only movement is her hand as it slid up and down your cock, milking out every drop of cum she could.

As your orgasm faded off, you looked down to see that Carrie moved her arms down over her chest, covering her tits as she rose to her feet. Strangely she didn't look any taller like you expected though.

"Wanna see how I grew?" she asked. You gave a gentle nod, and Carrie had an enormous smile on her face as she lowered her arms. Everything else about her looked the same, without any hint of growth, except for her chest. Her breasts were as perky as ever, but had swollen a massive amount.

She hefted them both up, now easily two cup sizes larger than she was a minute ago. Carrie had to be an E cup at this point!

"I wanted to test something out, and looks like I was right. Guess I can decide where to grow exactly! I just thought about only my tits growing, and it looks like that's all that grew."

Carrie tweaked a nipple, giggling a bit before collapsing into bed next to you.

"Fucking fuck I can't believe I can control how I grow! This is gonna make it so much more fun!" she said. With both of you naked and exhausted, sleep came quickly as you passed out with your naked girlfriend in your arms.

(If you like what I've written here and would like to see more, please consider donating at http://ko-fi.com/masterfulmastus).