I didn't know what was going on. My sex drive was decreasing, almost like I was already satisfied without having sex or masturbating. Normally I wake up with a hardon, normally I jackoff in the shower or have sex with my girlfriend regularly but lately I haven't wanted to do either, the urges were just gone. I thought about going to the doctor because I knew a 19 year old guy shouldn't have this kind of problem but 19 year old guys don't do doctors much either so I figured I'd wait and see if anything changed.
I did try and figure out when this started if anything in my life had brought it on. To my best recollection it began at the beginning of summer so I thought about what that could mean and what had changed. The only thing I could think of was my sister had come home from college. Lisa, my sister, is a few years older than me and studying to be a nurse. Once she was done with school for the year she had returned for the summer, but that was the only thing that had changed.
It wasn't until mid-July that my suspicions of what was happening to me turned to something sinister. I woke up one morning and went to the bathroom to take a leak and my urine stream sprayed in three directions. The only time that happens is after sex or tossing off and the dried semen clogs my hole. I didn't wake up with my sheets gross from a wet dream or remember having one and I knew I hadn't masturbated either so what the hell? When I left the bathroom after cleaning up the mess I ran into Lisa.
"Hey, baby brother. How'd ya sleep," she asked, smacking my ass like in sports.
"Okay, actually really well. I don't think I even dreamed."
When I said this, the look on her face seemed strange like she knew I hadn't as well, before I said it. I began to put things together. Sister comes home, my sex drive drops, I wake up with dried cum in my cock and have been sleeping really good and not dreaming that I can remember. And Lisa was acting a little strange all summer toward me. I caught her watching me mow the lawn with my shirt off and she has been more touchy-feely than usual. I decided to do some investigating that night because something was just not right.
Before I went to bed I adjusted my webcam on my computer monitor to focus on my bed. Then I started recoding video, turned off my monitor to hide that fact and went to bed like normal. I sleep naked, have since high school. When I woke up the next morning I couldn't remember dreaming and my cock was soft, which never happened before Lisa came home. I had to pee but was too curious to see if the webcam had picked up anything.
Getting on my computer I stopped the recording and had to wait a long ass time for it to save and render the long video since I had recorded almost eight hours. I really had to pee so while it was working I quickly went to the bathroom and hurried back to my room, shut the door and locked it. The video was almost done, and I started it at the beginning. There I was, stripping down and getting in to bed. Luckily I have a streetlight outside my room that sends light into my window giving me a decent picture because when I turned off my room light it got much darker. I used the settings on my computer player to brighten the image as much as I could and then began fast-forwarding to see if anything happened.
Suddenly, about three hours in a saw a blur pass the screen, making me jump and stop the video to regular speed. To my shock and amazement I saw it was Lisa. She had something in her hand and was wearing her little nightshirt she sleeps in. I leaned forward, watching the screen with all my attention when someone knocked on my door, making me jump. I scrambled to stop the video.
"Who is it?" I asked.
"Lisa, can I come in?"
"I'm not dressed, what do you need?"
"I'm a nurse, Luke, it's not like I haven't seen everything before."
"What do you want, Lisa," I said ignoring her comment.
"Just wanted to know if you wanted to hang out today, maybe go to the beach or something?"
"Yeah, maybe... I guess."
"Okay, well, I'll talk to you at breakfast."
I waited a few seconds before turning the video back on and the volume down. I watched with increasing alarm as my sister pulled back the sheets very slowly to uncover my chest and arms. Then she put the thing in her hand on my shoulder just above my bicep. I looked at my arm in real time, seeing if I could see any remnants of what she had put there. In the video it looked like a round patch and stuck to my arm. I couldn't see anything now but when I smelled my arm I noticed a distinct aroma, like alcohol or some kind or solvent.
After Lisa put it on my arm she stood by my bed for probably ten minutes, waiting. Her back was too the camera and I could swear she was rubbing herself with her hands in front but with the bad video and light I couldn't be sure. After she waited she reached out to me and shook me. I didn't wake up! She even called my name and shook me again. The patch was a drug! My sister's drugging me!
If that wasn't enough to freak me out what happened next surely did. She pulled my covers completely off my body and grabbed my flaccid cock. My mouth dropped open. My sister was stroking me, and my cock hardened as I slept. Then to my amazement she leaned over and started sucking it. I stopped the video, leaned back in my chair and stared at the frozen image of my sister's mouth halfway down my shaft. My fucking sister was molesting me as I slept!
I felt my cock roll over, looking down it was growing on its own, something that hasn't happened for a while. The idea of Lisa sucking me had conflicting results. Naturally I was disgusted but also turned on. I wondered how long she had been doing this, and the answer was simple. Since she came home from school. It explained everything.
My cock hardened completely as I stared at the screen and I started the video again, too curious to stop. Lisa sucked me for a good while and it was now obvious she was playing with herself as she did it. Her free hand was just grinding away between her legs as she sucked and stroked my cock with her mouth and the other hand.
When she stopped she stood up and pulled her shirt off. My mouth dropped. I never saw my sister as attractive before. I mean, fuck, she's my sister. But the woman on the screen, now naked, was gorgeous. Her breasts were firm, round and matched her thin athletic frame. They weren't too small but just perfect. Her shapely bottom was amazing capping off her long legs. Her brown hair in a pony bounced gently against her sexy back and I noticed, as she turned, she had shaved her muff clean. My body just laid there, with my cock bouncing to my heartbeat. It was surreal to watch myself like this and not remember anything.
Lisa climbed onto my bed, crawled over my body and grabbed my cock again. She gave it a few strokes before tearing open a condom with her teeth and unrolling it onto my stiff shaft. Once it was unrolled, she lifted herself up, pulling me vertical and eased down onto my cock. I looked down at my throbbing penis between my legs, oozing now plentifully. The penis that I now knew had been in my sister's pussy, who knows how many times. My hand went naturally around it; I began stroking as my sister began riding me on the video.
My microphone began to pick up her moans as her efforts increased. I watched her grab her perky tits and pinch both nipples as she pounded down on my cock. She played with her clit as she grinded on my dick and moaned in enjoyment. I felt my pleasure increase as I stroked, so turned on by what I was watching. Lisa was riding me harder than a girl had ever ridden me. Just slamming down on my cock like no tomorrow and her noises were getting louder, but since my parent's bedroom was across the house she feared nothing.
I watched my body, unresponsive, bounce slightly as my bed moved from Lisa's assault. The girl had stamina and was in great shape. She rode me like that for over twenty minutes before turning around and doing the reverse cowgirl with her hands on my chest and her feet supporting her. This was when I got a great view of my condom-covered cock sliding in and out of my sister's very wet pussy. The look on her face was pure bliss. It was apparent she was going to cum soon. I heard her began speaking.
"Almost there... Almost there.... don't you cum yet, Brother. Don't you go soft on my yet!" she voiced with an angry tint.
About a minute later she began to cum, her body tightened up visually and she started to make small yelps between breaths, almost like a puppy. It was the sexiest thing I had ever seen, causing my balls to lift. I stood up and ejaculated on my desk and was shocked because of how little came out. It was a pathetic amount of semen, the least I had ever seen. Not only did it not shoot out, the color was off as well, just dribbling out of my slit onto the desk to make a grey mostly clear small puddle. I knew then that my sister had been draining me almost completely during the night.
I heard her talking again, on the video, "Good boy, Luke, you didn't cum until after I did. I'm training you well."
