Blackmailing Sister into Fucking

This story happened a few months ago, around November 2019, post corona virus.
My parents just got divorced and my father had custody of me and my sister since our mom wanted nothing to do with us. My dad was either drunk, passed out, high, working, at a bar, or hooking up with a random MILF he met at a club. Most of the time, he was never home so I’m VERY overprotective of my sister. On her 17 birthday, one of her friends mentioned she had a boyfriend. I listened to their conversation as my sister talked about how ‘it was the best sex ever’ and ‘how quickly he could make her cum.’ As I said I am VERY overprotective of Faith and my father, even though he is almost never sober, is too. I’ve always had a thing for incest porn and Faith was a very good looking girl. She has long red hair that reached her lower back, beautiful green eyes, nice B-Cup tits, a firm ass, around 95lbs, about 5’, and pale skin. Her little ‘Birthday Hangout’ lasted until about eleven pm before she started sending people home. Now this was unlike her. She NEVER ended a party. She was usually the last person to leave them. So when everyone else left I followed her up to her room. My room is across the hall from hers so I opened my door and went and sat on my bed and watched her, pretending to be on my phone. She opened her drawer and pulled out her journal. At first I didn’t think much of it and actually started to play games on my phone when I heard a soft, quiet moan. I pretended not to notice and flicked my eyes up to see her fingering herself while writing. Now this I thought was interesting. I waited for her to finish writing before she went out down the hall to take a shower. I quietly slipped into her room and grabbed her journal. I shut and locked my door as read through the journal. She started it only a month before her birthday. It was a sex journal. It had recounts of every sexual thing she has ever done. Putting it away for safe keeping, I locked it in my dresser and went into my bathroom. I had the master bedroom so the bathroom was attached. I took a cold shower and changed into my boxers before going downstairs to get something to drink. I heard my sister come down the stairs shortly after me and heard her quietly, almost silently gasp. I’m 20, 6’7, around 200lbs, workout everyday, have short brown hair, blue eyes, tan skin and angel wings tattooed on my back and roses on my arms. What she gasped about m not sure but all I know is it made me hard. I turned to face her, not bothering to hide my hard on, and leaned back against the counter. Faith was wearing a black lingerie slip on sleep dress, her hair was blow dried and in a messy braid.

“Greys! What are you doing up?” Faith asked, exasperated

“I can’t get a glass of water?” I replied, my dick growing the longer I looked at her. “Come over to the living room. I need to talk to you about something.”

I walked I’ve to the couch and patted the seat next to me. “So, Faith. When were you planning on telling dad about your dear boyfriend, Carson, was his name?”

“H-how did you find out?” She stuttered.

“One. You and Alice were talking about him. Two. Don’t write down every sexual experience you have with the guy’s name.” I laughed as her face turned white.

“You can’t tell dad.” She cried. “He’ll kill me.”

“Only one way you can get your sex journal back.” I said, setting my hand on her knee and ever so slowly tracing it up the inside of her thigh.

She shuddered and I pulled my hand away just before reaching her cunt. “Let me fuck you.”

“N-no. That’s incest. We’ll get in trouble for it!” She cried.

“I won’t tell anyone. And we’ll only get in trouble if we get caught. And if you don’t want dad to know about your boyfriend, then you won’t tell anyone so I don’t see what the big deal is. We’re not gonna get caught.”

“F-fine.” She obliged.

I grinned and flipped myself on top of her, pinning her to the couch. I slid her dress up and away from her throbbing pussy. I planted a soft kiss on it before licking her clit and fingering her. She let out a loud moan and entangled her fingers in my hair and pushed me deeper into her cunt. I forced her legs open wider with my other hand and picked up the pace. Shivers ran through her body as she bucked her hips wildly in pleasure. He buried my face deeper into her soaking pussy as she climaxed. I slowly licked her cum up off her pussy and stood up and pulled my boxers off. My dick was rock hard. I flipped her onto her hands and knees and spread her legs wider. I slid my cock balls deep inside her and she fell forward into the back of the couch. I thrust in and out of her fast and hard, each time going slightly deeper inside her. She let out a scream as she climaxed again, her walls clamping around my cock. I slid as deep as I could into her and came. I pulled her hips back into me and pulled out slowly. I pushed her aside and laid down on my back on the couch and pulled her legs over. She must have known what I wanted because as I nibbled on her clit, I felt her small hand wrap around my cock and her warm mouth start sucking on the tip. We continued this until both of us came again. She collapsed onto my chest, breathing hard.

“That. Was. Amazing.” She panted as she mindlessly played with my hair. “The best I’ve ever had.”

I smirked. “Does that mean I’ll be in the sex journal?”

She smiled back. “Depends. Are you gonna keep fucking me?”

“Of course.” I replied.

“Then you’ll be in it for awhile.” She said.

The next day she broke up with her boyfriend and we moved out into an apartment away from our dad a month later. As my writing this she’s been sucking my cock and distracting me, making me writing this take a lot longer than it should have.

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