Let me begin with a warning, this story is nasty. It will involve lots of "bathroom" play as well as nasty kinky sex. If scat or pee play are not your thing, I suggest you read some of my other stories. Thank you for taking the time to read this.
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All 3 of us are slowly waking up, my mum, my sister and me. My name is Julie and I am an 18 year old CD sissy. Both my mother and sister have been training me to act and look like a woman and as a result of that I am actually quite pretty.
What just woke us up was piss. After an especially nasty session, the 3 of us laid down on the bathroom floor exhausted from a session where they taught me how to suck cock and as we laid there, we all pissed ourselves. We fell asleep in a nice warm puddle of piss, but when it cooled it woke us up.
We were all naked except for stockings and garters which Mum insisted we wear at all times. The reason why she insisted on this was because Mum used to work in a whorehouse and her "clients" loved that look. So Mum made Becca and now I wear them 24/7. Mum took control and tossed us nice warm towels and told us to dry ourselves.
I looked at Becca my sister and said "Won't we still stink of piss?"
She giggled "Of course we will, but that just makes things so much kinkier."
"Ok Becca, get your sister prepared while I get all that we need." Hearing her call me Becca's sister made me realize that the fact that I loved being called a woman! With that Mum left the bathroom and took me into the bedroom.
"Mum is going to teach you how to fuck like a proper sissy Julie, so sit on the bed and cross your wrists dear." I did as I was told and Becca used leather cuffs to tie my wrists in front of me and then directed me to lie down on my back. She then brought my wrists above my head and tied them to the headboard.
Mum came back inside and handed Becca a different dildo than before. It was just as long, but plastic and was black. Mum giggles "I developed quite a taste for black cock at the whorehouse dear. Your Dad would probably disown me if he knew how many black cocks I had inside me."
Then she looked at me and said. "Julie, your sister is going to fuck you now. Being tied like you are now will make the fucking even more erotic for you. On one hand you are being forced to do this, but on the other hand when you are getting fucked you are accepting your new role as a woman."
Truthfully I was not certain I understood, but trusted them both and simply surrendered to what was going to happen.
"Bring your knees to your tits Julie." I did as Mum told me to do and then feel her warm fingers in my bum. She was lubricating my arse and I loved every second of it. Just then Becca came back inside and I saw the black dildo hanging lewdly between her legs. I knew in addition to the 8 inches of she cock hanging out, there was another 8 inches of she cock pressing into my sister's cunt.
My mum continued to work her lube covered fingers inside my arsehole. "When I was a whore dear, I could get men off just my using my fingers in their bum like this." I knew she was right because she had me right on the edge. "Mummy is just going to sit down and watch this sweetie." With that she sat down in a chair spread her legs and pushed a nice sized vibrator inside her cunt and turned it on. Soon the room was filled with the sounds and scents of the vibrator getting my mother off.
Becca knelt on the bed and placed the tip of the she cock by my arsehole. Being tied and having my knees to my tits made me feel so helpless and totally vulnerable. I loved it! Then I could feel the she cock starting to violate my arsehole. At first it hurt, but my sister went slowly and soon the pain turned to pleasure. I could smell the scent of the piss on both our bodies.
Finally my sister had her she cock buried all the way inside my arsehole and I looked into her eyes. Now I understood what my mother meant before. Being tied like this meant I could not resist being fucked, but the minute I saw the love in my sister's eyes I knew this was exactly what I needed.
She leaned over and tenderly kissed me. "Are you ready for this sweetie?" I nodded and then she started to fuck me. At first it was slow and loving but soon changed and she fucked me hard and fast. Suddenly she screamed! I did not realize why she screamed until a second later I felt the she cock in my arsehole start to vibrate. I glanced at Mum and saw she had a remote control on her hand. First the part in sis's cunt started to vibrate and then the one in my arsehole did too.
Mum continued to increase the speed of the vibrating she cock and soon my sister was lost in the throes of an intense orgasm. As she came I felt something warm on my face and realized I was cumming too. Being bent over like that caused me to cum on myself.
After a bit we came down from our sex highs and Becca leaned over and licked the cum from my face. She slid the cock from my arse and then walked to the side of the bed and placed it by my face. She smeared the cock on my face and I could feel shit from the she cock streaking it and then she told me to open my mouth.