Nothing she can do about it!

"So, this is how big they are now," you say aloud as you wiggle your left breast by the nipple. The heavy orb takes a lot of strength to make it all quiver. "I could smother someone with these," you continue as you use your arms to push your sticky tits together to form the deepest cleavage you have ever seen. "Well, that's not the only thing I could use! If someone likes facesitting, they better make sure they can hold their breath for a long time!"
"Who are you kidding? You would push so hard at their face that you would push their whole head inside of your hole!" You turn away so Kako can't see as the thought gets your cock leaking again. You don't want her getting any ideas. Without a thought though, you run your hands along the top of your ass, smearing any wetness you find there. You get more adventurous and start slapping it. Kako notices you got a rhythm going. "Just imagine that's not a crotch slapping you, but shoulders. And...I don't need to breathe. In case you had forgotten...just a reminder."
"Yea, knowing you though, you would climb right up my ass and have that dick hanging out like a tail!"
"Well, I did shove my tits up your butt not too long ago. Pretty sure I would leave my balls hanging out too in addition to my cock. We could do that. We would both have to drain first. Why don't you start that?" Kako has a bit of a smirk.
"Very funny. You are going to stay there for a awhile." You stop smacking your ass. "We can play with your pregnant fetish another time."
"Can't blame me for trying. I am a robot after all! Having my lovely shemale man carry me inside of him then give birth to me would be wonderful!" You never thought a robot would be curious about this kind of thing. It is gross, but you sort of understand. It might be fun, but you would need to be a bit bigger down there to carry her.
"Ok, I need bigger hips and thighs and ass to carry you then. Give me some special sauce, then punishment starts." You grab her dick and lick the head. It immediately blasts its special load onto your face, but you quickly recover and get your mouth in position for the rest.
"I was ready! Aren't I the best? That bit that hit your face will make you look like a girl too, and the hair will fall off everywhere it shouldn't be. Only temporary still!" You figured that's what was happening with the tingling feeling. Your fault for not being careful. No matter. The new serum flares out your hips wider, your thighs fatter and your ass outward. You flex your new bulk and feel ready. You walk off as she watches you, your hips swaying and ass wiggling.