I snapped awake on the couch and realised I must have drifted off watching TV. I looked at my wristwatch. It was midnight. With sleep in my eyes I rolled off the couch and stumbled from the front room down the hall past Stacy's closed door towards the bathroom, which sat opposite my room. I pushed the door and without looking up, with all the instinct of a single man used to living on his own and commanding his space, stepped into the cool tiled room.
I stopped in my tracks and blinked. Twice.
My eighteen year old younger sister Stacy smiled as she turned towards me from the sink. She was naked except for a pair of tight cotton white panties and the toothbrush she was just putting back in its holder. I gasped a little, dumbstruck by her body and with the ease in which she dealt with her brother's eyes looking over her. My eyes stared at her perfect, small, pointed breasts and the shape of her mound and ass highlighted so well by the little cotton briefs.
"Sorry." I mumbled and she giggled. "What's funny?"
"I gave you a woody."
She was right I could feel it bulging against my jeans, still growing and desperate to be free. I shook my head and raised my eyebrows before turning away, I was doing the right thing, even if as I turned I took a long last look at her knowing I'd keep the image in my spank bank for a long time to come. She giggled again as I walked into my bedroom and closed the door behind me. Leaning against the door I ran a hand down my face. I wanted to fuck my own little sister. As I stripped down to my shorts I thought that someone else might have found that easier to deal with but for me it was a big deal. I flopped face first onto the bed and hit the mattress with a soft thud.
"It's got to be the weed." I said to myself with a sigh. "It's got to be."
At 4 am I woke again from dreams of sex and siblings with a start. I was harder than I'd ever been. It's hard to describe but I was throbbing to the point that if my dick had seams the stitching in them would have started to split. I roughly adjusted my dick's position in my shorts. Even that, the most usual of touches shortened my breath and I gasped a little. My mind began to cloud over and rationality ebbed away under the flood of arousal.
I found myself in the spare-room, at the foot of the bed, stroking myself through my shorts and looking at my sister as she slept under the thin sheets. I stood there for a few moments before I slowly lifted the blanket from her and stood back to look at her again. She was still naked except for the white panties, her young pussy framed so beautifully by the light flimsy fabric. I pushed my shorts down and took my dick in hand, my eyes locked on her body as I began to pull on it. It wouldn't take me long, I could feel it already, ready to fire off a satisfying blast of cum and stumble to the bathroom to wash up. There was one more thing I wanted though, one more thing that I needed before I could satisfy the lust that had took me over. Still stroking my dick and deepening my breaths I leaned down over her and placed my mouth over her young pussy, kissing her through the fabric and feeling the warmth of our lips meeting. I felt cum rising up my shaft, filling my tubes. I screwed my eyes shut, my tongue flicking out at her clit through the panties as hot strings spat out over my hands and the side of the bed. I gasped and fell back to the floor as every nerve in my body jerked in unison and pleasure swept over me. It was worth the guilt I would feel later.