This is a fanfic. I have the Original author's permission to do this, so please enjoy!
(Check out sexgundam666, but if this is the stuff you like you probably have done so already)
*****
Marie's POV:
I laid there, on my bed, and cried. All I had to cover myself was a towel, wrapped around my tits, barely covering anything else. My dick hung off the edge of the bed, still about 4 feet long, but I didn't care.
I had just fucked my stepsister.
My life was over. I would be locked away, experimented on, and god knows what.
All kinds of horrible thoughts where flying around in my head, my head buried in my blanket, face down. Laying there felt like an eternity, like hell. At one point, well over half an hour after my breakdown, I got up again. My cock was back to normal, so were my balls. I looked in the mirror and took off my towel. My black hair matches my totally ruined black makeup. It came down all the way to my navel, slight curls throughout it. My tits were gigantic, and my nipples too. I loved them, they felt great, they felt soft. My stomach was flat, with a piercing through my bellybutton. And then the worst of it. My entire lower torso was still lightly covered in my cum from my monster cock that hung between my legs. I had never seen it like this before. I had my legs apart a bit so my balls hung freely. I could feel them by my knees, the stickiness tickling them. My cock hung down almost to my ankles, two or three inches above it. The tip was still dripping all the leftover cum that was sticking to it on the floor, and if I moved a bit to the side it would hit my leg, leaving a little splash of cum there.
My lower body had been nothing special. A mediocre ass, thinnish legs, a normal pussy, sometimes shaved. Now I felt like I had the most special lower body on earth. The freakiest, anyway.
Pulling myself together a bit I cleaned away all the cum from me, extra careful with the new parts. Every touch to them gave me a little bit of pleasure, and I did not want to get hard for the third time today.
Now I had to get clothed. I tried on all of my skirts, and if I had my dick wrapped around my thin waist, my sack was still visible, peeking out under. The skirt I had worn for school was totally cum-drenched. I could not wear that. So then I decided on sweatpants. I put on some boy's pajama underwear under it to keep my balls as close to my vag as possible and put them on. A bulge was still visible, but the black on black made it harder to see. It was a risk, but I had no other choice.
I had to get out of my room anyway at one point, so I decided that now was the time for it. I took a deep breath, and opened my door. I could hear my parents chatting in the living room. First I went to the bathroom, I had to check it out. Was Sarah still in there? Was she awake? Every single one of these questions had me shiver, and even though I had a huge hoodie on, I still felt cold. The door was slightly open. Only when I slowly pushed open the door I noticed that the trail of cum that my dick had left on the floor while running to my room had disappeared. Who cleaned it?
The door was open now, and I had a full view of the room. No one, not a speck of cum, nothing. Pico bello. Sarah was gone. I panicked more and more by the minute. With my heart beating like crazy I went into the living room. There was mom and Dan, Sarah's dad. Dan had already walked out the front door by the time that mom said:
"You and Sarah will be alone tonight. Have fun girls!"
And then she walked out without a word.
This was too much for me. I couldn't take this anymore. I laid down on the couch and passed out cold.
"Marie?"
"Uhh, Marie?"
I felt a light push on my shoulder. It was Sarah. The moment I realized that I got off the couch and tried running back to my room, but she held me.
"Please, Marie, wait! I.. I want to talk."
I waited. I slowly turned around, she let go of me. She had an emotional face, one I couldn't read. Then Sarah proceeded to walk around the couch, in a weird manner, as if she had an ache there.
Oh, right. I fucked her relentlessly.
As she sat her beautiful ass down on the sofa she told me to sit too, and I followed.
First there was an awkward silence. I hadn't said a word so far. All we could hear was the clock ticking. Sarah broke the silence.
"Please tell me what that was." She was confused, and with that confused gazed she checked out my body. Maybe scanning for a dick. Well there was nothing to find.
"Marie, please answer! What the hell happened?" She said with a louder voice. I noticed that she was trying to stay calm, but it didn't really work out.
I was too scared to say anything. My eyes were getting glassy.
But then I looked her in the eye, first time today. That gave me the urge to help her. Those eyes deserved an answer.
"I... I fucked you. I didn't mean to, I just kind of lost control, and it all got messed up, and-" she stopped me.
"How could you fuck me Marie? You were feet apart from me!" She exclaimed. Tears were rolling down my face, third time today.
"Sarah..." I started. This was absurd. "I grew a cock today. In class. And it got so huge, and, and..." my voice was cracking up. I tried saying something, explaining to Sarah everything that happened, but I had lost my voice, a slight sob.
We sat in silence again. A weird feeling filled the room, unexplainable, unwanted. We wanted to get rid of it.
"Fuck this. Show me" Sarah demanded in a harsh voice, in disbelief.
I did not expect that.
"You sure?" This could end badly.
Very hesitantly I started taking off my hoodie. During all that time Sarah could not take her eyes off my tits. The moment I lifted my shirt up and put it over my boobs, Sarah's mouth fell wide open. My still wrapped around cock just sat there, not bothered by anything. Sarah couldn't say anything, even when I proceeded to take off my sweatpants. If a mouth could be gaped even more than the norm, Sarah had surpassed that. She stared at my underwear that was filled with massive balls and the tube that came out the top. Standing up I took the rest off too and let my balls hang all the way to my knees. Sarahs breathing was heavy, even heavier than my balls at full capacity. She gasped the moment I untied my cock and let it fall over my balls, and the pull at the base of my phallus gave me a tiny hint of pleasure.