Toys

"I don't know what to do next," you say. She immediately springs up, her newly extended cock bouncing.
"I'll be right back," and she bounds out of the room, her gigantic watermelon tits and long cock swaying for your pleasure. She comes back a minute later with a long dildo. A double-ended dildo. You know what she wants.
"Come here and help me with this," she says as she easily shoves one end of it up her asshole. Your cum is still visible all over her ass. You feel a bit of discomfort as your bowels rumble, reminding you that they must be at least halfway filled with your sexy lady's semen. As you turn around and grab the buttplug to remove it so she can shove the other end up your ass, she asks you to help again. Confused, you turn back and see that she has pulled her cock between her legs, and has the head poised near her own asshole.
"Shove this up there too, please," she grins. You oblige. She spreads her cheeks wide as you slowly work the head into her asshole. Being a sex robot, you thought it would be easy. But you soon realize her asshole is like a normal human female's, and really start working it in. She is grunting as she tries to relax her asshole to allow two invaders in. Eventually, and with a lot of pushing and wiggling, you pop the head of her cock into her own asshole along with the dildo. She lays still a bit, getting used to the sudden girth in her hole. She then slowly pushes the dildo up her ass, sighing with pleasure as each inch penetrates her. She stops every once in a while to push her own cock a little deeper, until a few inches are inside, all she can muster with most of the length trailing between her legs. She gets about three quarters of the dildo up her ass before she shudders and lays perfectly still for a minute or so. She then smiles, and offers you the other end of the dildo. "My ass is now filled with your cum AND mine. It feels soooo good, and I'm stretched so wide. If I can do it, so can you!"
Realizing she wants you to keep in the butt plug AND stick the other end of the dildo up your butt, you ponder it a moment and do some quick math. You figure out it wouldn't be much wider than just her cock alone, you weren't going to be stretched anywhere near as wide as she is right now. You turn around and position the other end of the dildo and push back. You were right, it's a bit of a stretch, but only a little bit more than the cock you were just fucked by. You slide the rest of what is left of the long dildo up your ass, and are disappointed there is so little when you bump asses with your girl. Her ass cheeks dwarf yours, and so does her asshole. You feel her move and spread her cheeks wide. You do the same and push back hard, you both trying not to waste an inch of dildo. You can feel her large soft cock smushing between the two of you. She pulls back a few inches, and rams her ass back into you. You get the hint. You both do it this time. A loud slap, and you look back to see her beautiful ass jiggle with the impact. You feel it vibrate up the dildo, and feel her cock starting to get a bit tougher.
You both pull back and ram asses again, and again, and again for a short while. Your cock is achingly hard again. You feel her stop fucking back at you. Her cock trembles between your asses. After a short while, she slides down and lays on her chest. "My ass is soooo full of my own cum," she purrs. She notices your erection. "Give me some loving big boy," and she pulls out the dildo slowly, and waits for you to get in position. As you line up, she pulls out the dildo and you quickly jam your cock inside to replace it after a small gush of cum squirts out, covering her cock and yours. She feels even tighter than the first time, and her cock gets hard again during your fuck.
"It's like you are giving me a handjob with your dick...this is so kinky...I think I'm going to explode again!" That gets your balls tingling and ready to burst. You feel her cock squirt her load into her ass, and you do the same. You wonder how much cum can actually get through her cock with it at such an odd angle. How much cum does she really have up there? After you are finished, and feel her cock's spasms subside, you reach into her bag of toys and pull out a plug you estimate must be the size of her stretched asshole, and removing your cock and hers, you jam it in before too much cum escapes. She moans.
"Two asses full of cum," she whispers almost inaudibly, "how could this day get any better?"