She still has lots of juice...

Before you can even ask her if she is finally done, she starts moving in you again. She doesn't really fuck you, but just grinds away.
"Your ass is looking very red, so I'll just grind out this one," Kako informs you. She does a full-body grind against you. You move your hands around to grasp her flaring hips. Your ass is sandwiched between the two of you, and the soft flesh is smushed out to the sides. Kako's tits are not, since her bra functions in the same way as yours does. Kako's hands are busy feeling up the sides of your tits and belly. You can hear her heavy breathing in your left ear as she rests her face on your back.
"Getting tired? You must be almost out of juice, finally!"
"I am tired, but this log hanging between my legs is not. Since I am just a female with a penis, my orgasmic patterns are more designed for the long haul than impregnation." You beg to differ on that point, but she drones on. "That means I get the best of both worlds. Huge amounts of cum and the ability to orgasm many times. But my penis is still a penis, it doesn't stay satisfied for long. Hopefully this will do, but I never know until after each one..." Kako erupts into your ass for the fifth time in a row. Your pregnant belly is once again being guided upwards and out of your shirt top where you have unbuttoned it. Your cleavage is pushed further apart by the growth. When it stops, it has reached your collarbone and flows out around your shirt. It looks like a flesh-colored pillow is stuffed in your shirt.
"Break time is over, ass. Time to get pounded again," Kako declares. You feel your ass expand back outwards as it is unsquashed. Then Kako starts bouncing off of it again. If your ass is red, it doesn't hurt. Slap, slap, slap, slap, slap, slap, slap, slap, goes the sound of your two bodies colliding in intercourse. You wonder how those girls that do the marathon gangbangs manage to pull off 200-something fucks in a row. Well, they probably take breaks to drain their pussies or asses or both. But you figure that nothing but an ass could take this much cum or it would burst. Or maybe Kako's anal injections have just made you special. Either way, she isn't going to stop until she damn well wants to. Oh boy, she is cumming again. You can't see your feet or anything else over the curves of your belly. You feel the part sticking out of your shirt on your neck as the pillow-like mass expands upwards. You can actually feel it on the sides of your breasts too as the three jumbo body parts fight for room on your chest. You let your chin rest on the cum-filled flesh as it wobbles from the continued fucking. At least she is using long strokes again which causes her balls to swing between your legs and hit yours.
"You are holding up well. Thank you so much for your help thus far. I must have really needed this," Kako tells you as your ass is assaulted. You must have been fucking for hours now. "Oh, this was quick!" Kako achieves orgasm again in mere minutes. You actually feel your belly stretching on this one and you moan and rub it with your hands. You just feel so big. It has been a while since you actually felt stretched by Kako's cum. You don't mind testing your limits. The expanding has stopped upwards at least now that it sticks up all the way under your chin. It appears to be growing sideways now. At least that is where your shirt channels it.
"Oh Kako, I'm soooo full of your cum! Is there more? I'm growing sideways now! I'm so big! Your big fat pregnant shemale lover!"
"Yes, there is more, but don't be so improper." She is really sticking to her roleplay. She goes full speed up your ass again, but is gripping your new love handles instead of your hips. You put your hands over hers.
"Cum, and feel what you are doing to me," you tell her. She stiffens immediately at that comment. You can feel your hands on hers rise away from your torso as the liquid fills your insides. "Rather nice, ugh, isn't it? I, ugh, can't wait for the next, ugh, one..." That one was a bit hard on you. You aren't used to being so big, but you are resolved to take at least a couple more if she has it in her. She can't seem to stop feeling up your sides and reaching as far around to your front as possible. On your end you are gripping the base of her shaft again trying to get her to cum fast. You manage another five minute job and accept your reward for a job well done. Your belly has filled up the sides of your shirt so much that it is pushing on the undersides of your heaving bosoms. This one didn't feel so much worse compared to the last. Your body must be getting the message. You do realize after shifting a bit how front-heavy you are. Only your ass's tight grip on Kako's log keeps you from falling forward. Of course, your vice-like anal grip and your shemale fucker's fetish over your condition makes this a recipe for more cum. With nowhere else to go, you simply expand outwards more in front.
"Kako, I'm going to fall over!" You warn her as she cums, but she isn't really in the mood to listen. You grasp her arms and manage to stay upright as Kako moans her climax. She thrusts at you a few more times before grasping your ass.
"I LOVE this ass! Oh, I'm done now, thanks! Should not be leaky for a while!" She seems to be out of character now. Kako withdraws from your butt and you keep your muscles closed to hold in all of her cum. She straightens herself and does the same for you. She holds you up the whole time so you don't topple over. "Wow, nice shape! If I didn't just cum in you ten times, you would make me want to nut another ten! My balls do sadly need time to recover. But what do we do about this? You are going to fall over!"