Not the first time, but hopefully the last...

"Kako! You can't keep doing this!" You yell at her. "What am I going to do when my jugs get as big as a car?"
"Hehe, then I'll ride you! Don't worry, that bit you lubed your ass with should make it fine." You do notice your buttocks balloon a bit further.
"This is what I'm talking about! You can't just keep it growing every day! Sure, it wasn't my plan to grow breasts for you to suck and fuck, but I was fine with it when they were DD, your size, or even twice your size. It's getting a bit out of control though."
"Oh..." Kako seems disappointed and looks away. "I thought it would be fine since you really wanted to please me. I got a huge fucking cock, and that cock needs a really big pair of knockers to fuck, and a really huge ass too. When you take it so easily, I just want to get bigger. But then your tits are too small, your butt too small and so on. But if you think it's too big, you can just wait it out. If I don't keep up with it, your original genetics will take over and shrink you back to normal in a few months."
"Hmm...I thought this was permanent. Well, I guess if the issue of me being like this forever is off the books, I'm not so worried."