I can remember exactly when it began, my love affair with my sister. It happened not long after my eighteenth birthday and took us both completely by surprise. Cheryl and I lived in a small two bedroom apartment in the city and I was the lucky one that got to sleep on the couch. My sister was a year older than me and would wake up and hour before I did so she could get the bathroom first and get ready for school. She was a senior in high school and I was a junior. Everyone thought that we were twins and I had just flunked a year in school, but we weren't twins, we were just close. We had a single mom who worked two jobs as our only parent and we learned long ago to rely only on each other for support.
It was towards the end of my junior year in high school that things became uncomfortable between us. She had already fully developed and guys were paying way to much attention to her than I'd like. She was spending less and less time hanging out with me and more time going out on dates. The dresses turned to shorts which turned to skirts that grew shorter and shorter. Her shirts got tighter and smaller with each passing month as her breasts grew larger. I tried not to stare, but each morning I would wake up and catch a glimpse of her walking out of the bathroom after her shower and walk down the hallway towards her bedroom wearing nothing at all. She always assumed I was asleep, but every now and then I would wake up just as the shower turned off and so I waited and watched for her. I didn't know why I was watching and even though I part of me told me I shouldn't be watching, something else inside me was making sure I didn't miss her.
This went on for another couple of months and then school was out. We had only the summer before Cheryl went off to college. I was still sleeping on the couch and waking up early to catch a glimpse of her, but she was sleeping in now that school was over.
One morning I woke up to the sound of the shower running and felt a smile grow across my face. I kept a lookout for her and listened for the water to turn off. It never did and her shower seemed to last forever. I quietly got off the couch and snuck over to the shower door and found it half open. Mom was still at work and she assumed I would be sleep so she didn't even think to shut the door. The shower was running but the shower curtain was half open. From the doorway I could see my sister lying in the tub. I could see the top half of her body that wasn't covered by the curtain. Her head was tilted back and her eyes were closed. Her breasts were half submerged in the bath water, but I could clearly see her beautiful large nipples...fully erect above the water as her chest heaved up and down. Her arms were to her side moving back and forth. I couldn't see her hands but I immediately knew what she was doing.
I didn't even realize my left hand had slipped beneath my boxers and was holding my dick. I couldn't keep my eyes off of her as the water began to splash out of the tub as she moved her hands faster and faster. My own hand began squeezing my cock as I watched her masturbate in the tub. She looked more beautiful than I ever remembered her being and as I stood there rubbing my cock, trying to be as quiet as possible, I hoped this moment would never end.
"Fuck me," she began to whisper which startled me at first. "I want you...give it to me."
Her arms splashed harder in the water as she rubbed her pussy faster and faster behind the shower curtain, her lips open wide as she moaned louder and louder. I pulled my cock faster and faster while I stared at her beautiful shaped c cups covered in water just a few feet from me. She kept her eyes closed the entire time, but by now it didn't matter. I would not have been able to stop myself even if she opened her eyes and saw me standing there with my cock in my hand jerking off to her.
"Fuck me David...hurry up...I'm ready to cum...I'm almost..." That's when it happened...when everything changed. She called my name. That was my name. She was thinking of me. "Oh fuck! Yes...right there..."
The sound of her voice sent me over the edge. I stepped around the corner of the bathroom and leaned against the hallway wall. I could feel my legs grow week and toes began to curl as it built up inside me stronger and stronger. I shoved my cock back inside my boxers and squeezed it hard and gave it a few more quick strokes and felt my cock explode in my hands, soaking my underwear as I finished myself off while watching my sister have an orgasm.
I heard the shower turn off as she stepped out of the shower so I quickly ran back to the couch and jumped under the blanket. I was still breathing hard when she walked passed me wearing nothing at all. I opened my eyes as she passed me, catching a glimpse of her dark soft hair covering the soft flesh between her legs. I couldn't stop imagining her hand rubbing that very same pussy just moments before and couldn't get the sound of her voice calling out my name.
"Wake up sleepy head!" Cheryl called out a couple of minutes later. "I know you're not asleep. Get up David."
"
I know you're not asleep?
" She had asked...did she know I was watching? Did she see me getting back on the couch?
I kept my eyes closed as she stood next to me. I was half afraid to open my eyes fearing she would be standing there naked again and I would get an erection again. She knelt down in front of me and pulled the sheet away from my face.
"Wake up David," she whispered to me with her lips just an inch from mine. I opened my eyes and found her smiling back at me with her gorgeous green eyes. "That's better."
"What are you doing Cheryl?" I asked after yawning, pretending to still be half asleep. "What time is it?"
"I saw you watching me you know." She said with a smile. "Before you say anything though, it's ok. I don't mind...I didn't mind. I don't want you to think..."
"You saw me watching? You didn't say anything? Why didn't you...What were you..." I didn't know what to say or what to even think, but kept watching her the whole time and realized she still had that same grin on her face. She really didn't mind, in fact it would seem she enjoyed it as much as I did.
She slid her hands under the blanket and slid her fingers between my knees and slowly pushed her hand higher up my legs.
"Look, I know you've been watching and staring. I thought it was weird at first, but then I kind of liked the attention. Didn't you notice I stopped wrapping the towel around me after my shower in the morning? I kept waiting for you to say something, but you never did." Cheryl explained to me trying to make it clear to me how she felt.
"You did that on purpose? You knew I was watching you every morning?" I couldn't believe what I was hearing, but found myself relaxing my body and letting her hand slide up even higher, both of us pretending this wasn't actually happening.
I let my right hand slide off the couch onto the floor next to her body and slowly ran my fingers up her thighs as she moved closer to me. Her finger tips slid beneath my boxers and stopped just short of reaching the tip of my cock.
"Oh, that's right...you came already," she laughed and rubbed her hand against my soaking wet boxers. "Too bad you left the bathroom though, I was hoping to watch you cum all over the place. You know I left the bathroom door open on purpose right?"
