My sister looked up at me. "What do you need...?"

My sister looked up at me. "What do you need me to do?"

"Mick, I can't...ask you to do anything," I said. "But I have to tell you, as this thing takes hold I won't be able to... It heightens aggression. I won't be me. Or, I will be me, but I'll...I don't want to hurt you."

"You'd hurt me?" she said.

The contradictory urges inside me swirled with such ferocity that thinking was becoming harder and harder. "No, not because I wanted to, just, because...I need...Mick, I need..."

"I get it," she said. "Can you step closer?"

I fought against my swelling muscles and the fireworks shooting between my joints to plant one foot in front of the other. I couldn't get much closer in the cramped restroom stall, but I could lean my hips forward.

Michelle scooted to the edge of the toilet seat.

Without a word, she drew her palms down my front, down to the base of my shaft. She used her fingers to spread my growing pubic hair away from it, dragging her fingertips from the base out to the skin of my crotch. Then she leaned her face forward. With one final look up into my eyes, she opened her mouth and let the head of my cock part her pink lips. She pulled me forward with gentle pressure in the small of my back, and took me an inch at a time. It was difficult to get her mouth wrapped around the size of it, but she kept going. I stared, dumbstruck, until I felt her warm tongue slither along the underside of my swollen shaft. Slowly, she guided my head to the back of her throat.

I groaned deeply. "Oh my God, Micky." I brushed the back of her throat, then retreated. She kept her hands on my hips to keep me at bay, but allowed me to push forward, slowly, between her blushing cheeks.

I reached out to grasp the back of her head. She allowed this, too. I groaned anew when she reached into my thick nest of pubic hair and cradled my balls. The first time I heard her suck the saliva off my shaft, I pulled my cock free of her mouth--just to watch her breathe. Precum dangled between my penis and her lips. "I can't...I can't believe I'm doing this," she said, her voice thick, her lips sticky. But she reached for my cock again anyway, and guided it back onto her tongue.

"Thank you," I breathed.

When she pulled me out again, she ran her fist down my slick shaft. "Is that good?"

"Yes," I groaned. I pulled her head down, back onto my cock, and she got the message. She bobbed down on it quicker this time, running the head back and forth between her lips. I had reached a precipitous stage. The closer I came to sexual fulfillment, the harder it was to restrain my baser urges. If I lost control...

Aggression flared inside me. "Suck my cock," I demanded.

She "mmm-mmm!" obediently, and grabbed the backs of my legs. I began to push myself in and out of her mouth more forcefully, and she took it.

She took it for the first few seconds, but then she had to pull herself back. "Wait!" she gasped. Spit dripped freely from her lips. "Wait..." Precum shined at the corners of her mouth.

"I'm sorry," I said. "It's...it's happening too fast."

"Aaron," she said. "I..."

I traced my cock along the underside of her lip while she stared at me, her upturned face flushed a deep red and the sweat clear now at her temples. "I'm sorry," I said again.

"No, don't be sorry." She kissed my penis, and cupped it against her cheek. "I'm...just kind of turned on right now. Tell me when you're going to cum, okay?"

Excerpt from Sibling Affairs: 4 Erotic Tales of Brother/Sister Taboo (Vol. 2) - now available on Smashwords at 25% off!