Six Weeks Ago

"He's a real jerk," I said, after picking up Carly from her first college party. Her boyfriend, a wannabe Chad named Rod, broke up with her, quite publicly, and was already macking on his new girl toy. She and Rod were close since High School, but the college scene had changed him, for the worse. I never liked the guy.

"I don't understand," she stifled a tear. "Thanks for picking me up," she looked up at me and smiled as we pulled into our home. I half-smiled as well and pulled in. "Wait..." she rested her hand on mine and I remained.

"Carly..." I started, noticing her breathing heavy as the lights in the car dimmed. Then she did it. She kissed me. "... what was that for?"

"For rescuing me, silly," she leaned in for another kiss, that was not well-received.

"Woah, woah, woah," I pushed back. "You're my sister... we can't kiss... not like this. I..." I paused. "I have a girlfriend. And you. You had. No, no, no. This is a rebound. This isn't right. You're drunk."

"I'm more sober than I've ever been," she said, leaning in and practically assaulting me into making out with her. I could tell by her deep breath that she wasn't lying, having avoided **** at the party. Before I could process what was happening, she had undid my seatbelt, flipped around me, and was straddling me in the driver's seat as she was unbuckling my belt. God damn, she was agile.

"Wait," I said, between kisses as she was unzipping me now, my growing erection feeling her actions. "We can't."

"Mom and dad are out of town. It's just the two of us. No one will know."

"No," I said, gently pushing her off as I reached for the door. I was standing outside the car now as she stared at me. "There's so much wrong here."

She stepped out into the garage, her cocktail dress slipping off, exposing her small, perky breasts to me. "Tonight was supposed to be my first time. Rod took that away from me. ... You love me, right?"

I shook my head yes.

"Then show it."

Fuck it, I thought. In fact, fuck her. That's what we did. Slowly, but surely, we made our way into the home, up the stairs, into her room, never losing hold of one another, never losing sight of each other. Her dress was in the garage. My shoes were by the door. Her panties were on the stairs. My shirt was outside her room. She pushed me onto the bed, and narrowly missed being whacked by my cock as my pants were dragged off. She licked my sweaty penis, but didn't suck it, smiling as she began kissing my stomach, chest, neck, and face. Although we were fraternal twins, I was much taller, and she made out with me for but a moment before sliding down to accurately straddle me once more.

"Are you ready?" she asked, cock in hand, guiding it to her entrance.

"I should be asking you..." was all I managed to get out before she fell on top of my sword.

She didn't let up. She didn't give me a chance to stop. I held onto her hips as her breasts moved up and down independently of the rest of her body. "Fuck," I said, aptly describing the activity. She may have been a virgin, but I couldn't tell, lacking much experience in that field myself. But we gave ourselves the experience necessary, and before long, I gave her what she wanted. Intimacy, love, all wrapped up in a tiny white bow.

We had no way of knowing that my swimmers were probably already super-charged.

Six weeks later:

We were inseparable after that. I broke up with Lonnie, she began skipping school. Every time my parents were out of town, she was tapping on my door wanting another fuck. And I obliged her, every fucking time. It was exhausting but rewarding. Loving but underhanded. Our lives would be ruined, or so I thought, if word ever got out. She took a morning after pill, I began wearing condoms, but none of that matters now.

I stood over my mother as she directed her husband to talk.

"Clark, we found the pictures," he said, solemnly.

I did not lose eye contact as I stared down at her. She glanced uneasily at my cock, having mixed feelings about her son standing naked before her. Carly was wrapped in my bedsheets, naked underneath from all the fucking.

"I'm an EDP. I can take as many pictures as I want. Of whom I want."

"Yes," said my old man, stepping forward, but then back as I gave him a quick glance. "...but they're from before. Before your diagnosis. And... Carly's pregnant. Six weeks pregnant."

I had figured that. I had only fucked two women in my life, well three now, Lonnie, Carly, and Nurse whatshername. I wore a condom with Lonnie, but it probably didn't stick. I wondered about her status.

"Mom, Dad," I stepped back away from my intimidation tactic, towards Carly, where I quickly pulled away her sheet to expose her naked form as I wiped off any excess sweat with it. "There is no 'before,' I've always been liked this. Just more subtle and undiagnosed. Carly is my primary fuck now. She's the mother of my child. You best get used to that."

I grabbed the table of EDP pamphlets that I had studied, and tossed the ones on the floor providing tips and tricks to fucking your family members, with real photos of family fucking from around the world. "We've been fucking behind your back, but that ends now." I grabbed Carly and maneuvered her towards the food table. Her nipples were hard, I could feel, as I pushed her forward and started rubbing my cock into her. She bit her lip as I began fucking.

"Let's go," my Mom said, as she turned with her husband to leave.

I grew annoyed. "Wait..." I said, as I quickly stopped the fuck and rushed to the door. I grabbed my mother's purse and turned her around. "I think you need a more personal demonstration," I said, as I began to unbutton her shirt.