Chapter 1 was a mix of real experiences I've had and my own imagination. The remaining pieces of the story are my own fantasies as to where it could go from there.
*The Conclusion of She's All Tied Up*
About 15 minutes after I'd lit the candle and left it on the window sill in my bedroom, I went back to the play room, cock already hard and slick, and mounted my lady friend again with no pretense or warning. As before, she gasped and started to moan with the pleasure, and as before, I stopped after a few minutes of pumping into her and brought my shaft, covered in girl juices (and a bit of the cum I'd left in her earlier) to her mouth, which she eagerly started sucking. She suspected, I think, that this load was going into her mouth, as both her other holes had been filled.
So please, imagine her surprise, a moment later, when she felt a second pair of hands on her hips and a moment later felt herself being penetrated by someone else.
Time to back up. About 10 minutes after I'd lit that green candle, my next door neighbour, the dom lady, had arrived and walked in quietly to my bedroom, me having left the front door unlocked for her.
In my room were the results of our online shopping from the other day: a harness for a strap-on, and a double-headed dildo of moderate stiffness. We'd originally looked at getting a regular strap-on, but we decided it would be better to combine it with a double-header, so that the movements would effectively fuck dom lady's slit as she screwed my lady friend.
To make sure I was ready for round 3 (I didn't need much convincing; the anticipation was building me up nicely), lady dom took my shaft in her mouth while cupping my sack in her hands and tugging on it gently. I was quickly fully hard again, and I bent her over my desk and thrust in and out of her slit twice, just enough to get my length coated with her juices (I did this just so I could double dip between my lady friends).
This done, we gently fed the length of one end of the double headed dildo into her moist pussy and brought the harness in place around it, securing it near the middle. Together we walked silently into the play room and proceeded as I've described above.
To say that my lady friend gasped in amazement would be an understatement. She was used to taking orders from me, and she was used to being used, tied up, and generally called (and treated like) a complete slut in our play. We were under the agreement that I could do to and with her as I wished in our play. Still, we'd never included anyone else in our play.
As she opened her mouth in gasping, I pushed my length deeper into her, grabbing the back of her head and holding her in place.
"Quiet, bitch," I said, "you're going to take it, and because you enjoy being used so much, you're going to get off on it."
Then to my dom lady, I said "go ahead. Spank her for being such a slut. She'll enjoy it, and it's what she deserves for letting you do this to her. Give it to her good and hard while you're at it."
Dom lady hadn't yet said a word (we'd agreed up front that her identity (and until it became time, gender) wouldn't be revealed to my lady friend until we were finished), but happily proceeded with thrusting away at my lady friend and slapping her ass in the process. She was clearly well experienced in spanking too, as she varied both how hard each blow was delivered as well as making which cheek would receive the next hit unpredictable. I watched her face as she went about this, and I could see that she was riding the lightning, sexual pleasure from the dildo's movement inside her from each thrust mixing with her enjoyment of using her new found play toy (my lady friend).
Within a few minutes, my lady friend was beginning to spasm again her bonds in the throws of the first of another round of several orgasms. Beyond a guttural moan, any more elaborate sounds were prevented by my cock, still deep in her throat. Sensing that this was the time, I moved to take charge of her front end, thrusting in and out of her mouth deep and hard, definitely moving into the face fucking mode of things. She just opened her jaw and let me go to town, the intense sexual sensations of her treatment from dom lady overpowering her senses.
Soon, too soon and yet not too soon, it was over for me. Another hot gurgling mess of my cum shot out of me and into the back of her throat. She closed her lips tightly over my shaft and swallowed me down.
Spent for the moment, I pulled out and watched dom lady continue to pound her. After another orgasm had subsided in my lady friend (and dom lady looked as if she'd had a couple of her own), lady dom pulls out as well, and quietly goes about unstrapping the strap-on harness and removing the double-header from her own pussy.
I'm going to be honest here. I have no idea if my lady friend knew by now that she was being fucked by a man or a woman. I don't honestly care. She was (and had been for a while) my sub to play with as I saw fit.
Regardless, lady dom had asked that she get to be eaten out by my lady friend, who was still, mind you, lying upside down. This isn't a conducive angle. So at this point I told her, "I'm going to untie you now and flip you over. Your use and humiliation aren't over yet, but they will be if you're a good girl and behave. So don't try anything once you're unbound. Don't move until I move you."