From MFR to SisFR

Julie left her bedroom door wide open. I walked out of the hallway shower wrapped in a towel. As I approached her bedroom, I could see her standing naked in front of her dresser. I stopped and undid my towel letting it drop to the floor. Julie looked over at me and saw my cock getting hard. I could see the reflection of her tits and her full black bush in the mirror. She smiled. Then she turned facing me. She reached down and spread her pussy wide open exposing her pussy lips and pink wet cunt. Her lips were big and dark like butterfly wings. My cock throbbed in midair wanting nothing more than to take her. We met next to her bed. Her hand held my cock while I slid my finger into her pussy. "I knew we would do this. Fuck me like you would fuck any other woman." She put her lips to mine and we began a long-wet kiss as we fondled each other. She laid on her back spreading. I went down on her and teased her clit and built her up. Then I suckled her just right to make her pussy squirt all over my face. Then we began fucking. I went deliberately slow at first to try and make things last. It was hard not to come prematurely. The act was so forbidden that it was extremely exciting. That was what made it so hot. Both of us were into our taboo act. I had to literally stop, pull out, and squeeze my cockhead to stop it from shooting come in her. "Just let it come. I'll get you hard again."
"Okay."
I slid back into her. I started slowly. "I want your come in me. You're a sister fucker. Pound that pussy."
I sped up. I was on my arms thrusting into her. Our bodies slapped together making wet sounds as her pussy squirted. "OH GOD! FUCK ME! FUCK YOUR SISTER! COME IN THAT PUSSY!" For some strange reason I had more stamina. I pounded that bitch hard and fast making her scream out loud. Then I finally started to shoot. I growled and hollered out loud as I fed her my in cest sauce. It felt just as good as when I filled my mom's pussy with come.
"Wow! We finally did it!"
"That was awesome."
"I could get used to this."
"Me too."
I was supposed to go back home that Sunday. I called my work and took another week off to stay with Julie. We fucked like porn stars every day I was with her. We made plans to move in together so we could enjoy ourselves regularly.