You feel movement.

Soon after your next cum, you feel Kako moving. The cock you were riding flops out. It seems like Kako has grown weary of life on the inside. You quickly get up and stand on the floor then bend over the side of your bed, bracing yourself with your arms. Even with your arms fully extended, your breasts rest heavily on the bed below you. Kako's legs come out as fast as they went in. The girth of her thighs makes you pant. You reach back, not to spread your ass, but instead to feel her cum-slick thighs as they widen in advance of her big butt and wide womanly hips. You lovingly fondle the undersides of her cheeks as they make you grunt in mixed pain and pleasure. After that is over, you realize it's easier going out than in. She soon pops her head out followed by her arms and tits. She stands as you are still leaning over the bed.
"Being born sure is interesting," she says.
"That's not quite how it goes normally," you return.
She moves to your side as you pull yourself upright. You swing your tits around and knock her to the bed.
"What's with these?" you ask her, hands on your hips, chest jutting out just in case she didn't notice.
"Oh...I think they sensed you were pregnant, so they reacted accordingly by swelling taut with milk. I see they are leaking nonstop though. That would be embarrassing in public. Well, let's just hope by next time you don't mind additional size!" Kako giggles as your jaw drops. "I think every time we do this, they will swell larger." You plop onto the bed beside her to the left, and your chest rests in your lap. She pats your right breast. "They are already quite massive. Would you actually mind them swelling? They don't even sag and yet rest in your lap."
"No, I guess not. I already went this far, after all. How long do you think my boobs will keep leaking like this, though?"
"I'm not sure; this is uncharted ground. We never had a subject do what we just did." Kako blushes a bit. "You really are amazing...in case I don't tell you often enough. The science is complex, but your body and all its parts are yours, and at the same time not. That's why it wears off over time. Your body may have incorporated some of it, though, which is why your breasts swelled like a pregnant woman's, even though you weren't preganant and can't be ever. Don't worry though. If something is changed it's permanant, and if it hasn't then it won't. Either way, no sense worrying now!" She grabs your face and gives you a deep kiss with extra tongue. After pulling back, she says, "With that massive quan-titty of tit you have there, expect plenty of cum cum-ing your way!"