It is more painful than she could ever have imagined. " Nuhungunaaaah," She is unable to make coherent noises. She is a woman with a demon on her back.....and in her vagina. I continue walking her forward with my thrusts. Driving her unmercifully forward until her head had only one place to go--down and against the bed. She knelt there, jammed against the head board, her cheek pressed brutally against the bed while I slammed into her. By now she is sobbing so hard her chest feels like it is. I was in full mood, I have covered with a blanket and slowly removed my pant and underwear up to the knees. She was not aware of it. My brother slept already as it was so late.I and my sister were watching some stuff on the facebook from my mobile. She was holding my hand very tightly as it was cold. I have slowly moved my blanket so that my dick and balls came out, which were visible to her.My dick size is 7 inches, she didn’t see it. I have moved my mobile little bit so that she can see my. It felt as if she was holding her breath and with a large moan let it all out.My mind was spinning at the possibility that I had just made my sister cum.After a minute she regained herself and panted "That was great, but now it's your turn."In all that time, I had forgotten her end of the deal.I was quickly reminded of it when I felt her hand opening the button to my pants and my zipper being pulled down.I felt the cool air as she lowered my pants to my knees. I could feel her kneel down and a. Physical AttributesOverall, the universe of Pussy World is both similar and very different to our own. The biggest difference, as you might've guessed based on the description, is that penises or testicles don't exist in this universe and life can reproduce without them. All species - including humans - have the equivalent of or actually possess a vagina. Possessing XX or XY chromosomes has overall less meaning here though men in Pussy World aren't trans men; they're cis, just by a measure that.