You gloat?

You sigh in relief at the lack of weight hanging off of your crotch. You hear sounds coming from Kako, and so you pull your nipples from her mouth and stuff them back inside of your bra.
"Well, this is a bit awkward," Kako groans.
"Serves you right. That should teach you to fill me that big again!"
"I can't even reach my cock!" Kako exclaims as her arms flail uselessly.
"It's safe, see?" You crawl up and rest your breasts on her rotundness.
"Can you shake your tits around to get me off, then pull me out so I can blast on those fat jugs?" You do as she asked and wiggle your chest for her. These things really are heavy. When she starts moaning that she is gonna cum, you extract her cock and aim it at your cleavage. You are blasted with cum, but not as much as you would expect. You reach back to carress her pumping balls but only manage another very tiny squirt. Very horny already, you let all but the head fall back. You use the wetness on the cockhead to lube up your butt a bit and sit on the head.
"Thanks, but I can't give you any more of the special sauce right now. Oh, look, it's kicking in!" Kako smiles from her helpless position under you. Your tits swell again. Your bra is so tight that your tits squeeze out of the top and bottom. Your shirt pulls up at the bottom and then completely exposes your belly. You pull your bra and shirt down, baring your naked swelling breasts.
"These should be more fitting for a preggo of your size," Kako says with a smirk. They stop growing soon after you had to free them.