You have a few conditions.

You put a hand on Kako's shoulder to stop her. "While I don't have a lot of problems with you fucking Kako, she was supposed to be mine alone, and so I have a few conditions, Mrs. Barstone. First, I want you over here every day, to watch you fuck Kako." Mrs. Barstone nods enthusiastically. "Second, I am going to knock you up when you recover from this pregnancy." To this Mrs. Barstone shrugs. "And last, when you come over every day, I want you to bring your two eldest daughters."
Mrs. Barstone looks horrified at the request for a second, then looks down and says sheepishly, "Well, I...a while ago I caught them making out with some boys at the mall. They must have gotten a ride from one of the other moms. As I watched, they let the boys feel up their shirts and down their pants. I was so horrified that I was about to go over and take them home and ground them forever...but then I realized that my little baby girls are adults now. So I didn't freak out when they got home, but told them what I saw, and let them know I was OK with it. They even asked me to share my sexual experience with them," she concluded with a smile. "So if you are saying you want me to trade sex with Violet and Judy for sex with Kako...I can agree to that. Now please, I am so horny, I need Kako to continue to fuck me!" You look at Kako and nod, and she brings up her hands and starts fucking Mrs. Barstone with the tip of her cock again. A lot still hangs out, but you are surprised that Mrs. Barstone can take over a foot of it inside her. You suspect that if her womb wasn't taken up with a baby, Kako's cock would go all the way up another foot.
You watch Kako fuck Mrs. Barstone all over again, but this time there are a lot of squishing noises, as Kako displaces her first load with each thrust. You stand there, still holding Kako like you were when she came into Mrs. Barstone the first time. You realize you don't just have to stand there. Your cock is hard and nestled inside Kako's huge ass crack, and her thrusting ass cheeks are massaging and grinding into your cock. You reach around and rub Kako's cock a few times as it emerges from the willing pussy it is fucking, getting a good gob of their mixed juices on your hands. It's really mostly Kako's cum, but you are sure there are some of Mrs. Barstone's juices mixed in. As you gather cum, Kako begins thrusting harder. She is really fucking Mrs. Barstone hard now, and her large ass slamming into you as she fucks knocks you over. You fumble around and try to grab hold of something as you fall, and you manage to get a grip on Kako's large breasts. You pull them around her sides as you fall. Your hands suddenly lose their grip due to the gobs of cum dripping off of them from the cum squirting out of Mrs. Barstone's pussy, and her tits bounce back into place. You make a grab at the last thing you can to slow your fall, Kako's flaring hips. Since she was in the middle of a backwards movement, her balance is off, and instead of slowing you down, she ends up falling with you. She grabs at Mrs. Barstone's breasts, but they are covered with milk and her hands slip off. You land with a thud, and then your shemale lands on top of you, her ass cushioning the blow to your pelvis. You wonder why she has tensed up, then feel the tightness around your cock. You have entered her ass in the fall, and without any lube! Kako takes a look around to try to see you penetrating her virgin asshole, but her ass is spread out around her like a pale white pillow, completely consuming your cock and balls. You can feel her balls resting between your legs and against your ass.
Kako's shock leaves her face, "If you wanted to fuck, all you had to do was tell me." She winks, "But now, since you invaded me without getting me ready first, you are going to have to take Mrs. Barstone's load of my cum up YOUR ass as punishment. All that lube should remind you to lube me up before an assfucking." She turns all smiles, "Well while you are in there, do you want it like this?" She bounces up and down, her ass completely swallowing the sight of your cock the whole time, despite that she is lifting up several inches each bounce. "Or," she turns around, "do you prefer the full frontal view?" She continues to bounce, her giant balls rebounding off of your chest, and her breasts jiggling all over. You can feel her buttocks on the sides of yours, as they are so big they are covering your whole crotch and resting on he ground behind her too. Mrs. Barstone reaches between her legs and fucks herself with the giant cock she is using her muscles to trap there. "Well?" Kako asks, lowering her upper body to rub her breasts on either side of your head lovingly.