Yes

"You are about to get a lot fuller! I'm not dragging this all around forever!" With that, you push her forward and with your hands still on her ass, you shove your dick into it! Her dick remains stuck down your shirt. With the immense pressure inside of your distended balls, you nut the instant you bottom out. Even while your dick is not pulsing, cum is still shooting out. It feels good to let that pressure go. Kako's middle replaces the liquid underneath as you channel her cum back into her. She is holding her sides as they too start to expand.
"Oh, this is starting to hurt! Can you stop now?" Kako seems to be stretching to near your size now, judging by the state of her shirt.
"I can't," you tell her as you realize your muscles seem to be unresponsive. "The pressure was so intense, I don't think my body is going to stop until it's all gone."
"But...my insides...hurt!" She turns on her side and you can see that her shirt is starting to pull apart.
"You didn't let me stop before!" You pull out your nipples and lean over and shove them down her throat. You work the nipples until your breasts release a flow of your milk down her throat. You feel around her belly as it grows. It's so big! You still can't stop your balls from emptying. You wonder if she can take it all.