A watched pot never boils...

"Well, I'm not going to sit around waiting. I do, however, believe it is time for me to fist Kako." You gesture for her to get up. She sits there staring at you for a moment. "What are you waiting for? Time to get your ass stretched!"
"Yea, and if you are really good, you can get double fisted too," Jennifer adds with a grin.
"But..." Kako begins.
"Yes, your butt. Front and center," Jennifer commands. Seeing she isn't going to be able to get out of this, she gets up as ordered. Her breasts and face are soaked in cum. She steps up to you, and turns around. You and Jennifer rub your hands over Kako's ample boobs, getting yourselves lubed up.
"Uh, should I start? I havn't ever done this before," you query.
"It isn't hard. Just ease yourself in, and the lube will do the rest. Kako's ass will probably be hard to ease into, but give her time and you will slide into her easily."
You push your hand between her lovely buttocks. Your hand is carressed by her soft flesh as you search for her opening. Finding it, you push one finger in easily. Remembering you did assfuck her yesterday you don't give her time to get used to it and add the second third and fourth fingers in quick succession. Kako is squirming, but she doesn't complain. You position your thumb, and ease it in. The lube helps you slide in slowly. You can feel Kako's ass muscles twitching as they want to tighten to stop the intruder, but she makes them relax. You ease your thumb all the way in.
"How is it so far?" you ask her.
"Fine. Just shove the rest in quickly and let's be done here, ok?" Kako is just standing there, leaning over the couch and barely moving. Jennifer moves her hands up, and rubs Kako's cum all over her ass cheeks, and starts massaging them. You push hard, and feel Kako's resistance disappear, and you slide up inside her past your wrist. Kako gyrates her ass a bit.
"Should I start fucking her?" You wonder how long she needs to recover.
"Yes, start now. Pick up the pace once you feel her loosen up, it will render her muscles stretchy." Jennifer bends down and licks around Kako's left buttock. You pull your fist out. It gets a bit tougher at the knuckles, but you tug it out, and then shove it back in. After 5 or so times, it doesn't require so much effort. Her asshole gets the hint that it is expected to relax and stretch. You start to fistfuck her at a steady pace.
Jennifer stops licking Kako's orb, grabs her dangling cockhead, and stands up. She walks around the couch and sits down facing Kako. She offers Kako her own cockhead to lick. Kako can't hold it herself, as she is bracing against the fucking you are giving her ass. She licks it, and you feel her ass pulsing around you every time she runs her tongue along it. After a while, your arm starts getting tired. Kako tenses up all over. Her butt clenches at you inside and out, and you watch the first blast of her own cum hit her in the face. You take the opprotunity to start sliding your other hand inside her. She doesn't even notice. Her ass muscles clench with each pulse of cum, but then super relax as another readies. You make your move in time with when she is loose, jaming all of your fingers and then your thumb in. She still doesn't react to you. You give her a minute to get used to it, even though she is lost in her orgasm and does't even seem to know you added your other hand. What you figure is halfway through her orgasm, you start to push your second fist in. Each pulse earns you a bit more ground, and after another minute you push the last of it inside her. You pump your fist in and out in time with her orgasm, and soon you just ignore it all together and lay into her with both fists. Kako slumps forward onto the couch. She just lays there. It's not apparant whether she has noticed her situation yet. She stirs after you start hammering her ass with your fists, rocking her back and forth.
"You are so sly, make me cum and penetrate me farther while I can't feel any pain." Kako rights herself and stretches while you fistfuck her. "I will have to remember that is fair game from now on," she adds turning to wink at you. "That's enough for now, my ass is tired. So am I, to be honest." You remove your fists from her ass.
"Yea, I am tired. Hungry too, who's for lunch?" You look from one to the other.
"I'll cook us something, you two can stay here and relax those asses." Jennifer walks off to the kitchen. You and Kako move around and slump onto the couch. You turn on the television and stare at the local news station.
You wake suddenly, having dozed off. You check the clock to see you've been sleeping for about four hours. You get up, but let Kako sleep yet. You go in search of Jennifer.