When i was 16 years old i went to my doctors for my pre school year physical. My doctor was a very attractive mid 40s woman of lithuanian desent. I think she was into either fitness modeling or very lightcore body building. She had the most amazing legs which she usually had exposed by wearing a skirt every time i ever went there. She also usually wore strappy leather gladiator sandals or leather thong sandals. Anyway, by that age i would go into the exam room by myself for my physicals. When she came into the room i was sitting on the exam table and she greeted me as usual. I was wearing short silk running shorts with briefs under them and i had on a tank top. I also had on no show ankle socks and my nike running shoes. She had me undress with the exception of my socks and underwear. She took my blood pressure and as she looked down she noticed my huge stiff cock pushing against the inside of my underwear. I blushed but she just smiled and kept pumping up the blood pressure cuff. She then listened to my heart and lungs with her stethoscope and then hung that back around her neck. She turned around and walked over to the counter to record the info on my chart. With her back to me i could not stop staring at her perfect thighs and calves. She turned back around quickly and caught me staring down at her perfectly toned legs. She just smiled and scrunched the bridge of her nose. Then she had me lay on my back on the exam table and at this point there was absolutely no way to hide my hard cock. It stood straight up from inside my underwear and a wet precum stain was forming where the tip of my cock was pushing out against the inside of my underwear. She told me to put my feet on the table and thrust my hips up off the table a bit. When i did she slid my underwear off my ass and then down to where my feet were at on the table. She had me pick up my feet and she slid my underwear completely off me. She told me to scoot my butt to the end of the exam table and she pulled out the stirrups and had me put my feet in them. By now i was so horny that a small breeze would have made me cum. She picked up my medical chart on her clipboard and jotted down a couple notes. Then she asked me if i had any questions about my body, masturbation or sex. I hesitantely brought up the subject of masturbation and she just smiled and began explaining that it was normal and healthy. She asked me how often i masturbated and i told her. As a medical professional im sure she wasnt surprised by my answer of several times a day. Then she said. You know what this gives me an idea. Would you like to try an experimantal treatment i have been developing?. I asked her what it was and she told me it was a testosterone booster for young men that helps with quicker and easier muscle growth and development. I quickly agreed and she made me sign a paper which i truthfully did not read. Still laying naked on my back with my legs in stirrups she swabed my arm with an alcohol wipe and gave me 2 shots. One i assume was a vaccination booster and the other i assume was the experimental drug i signed off on. Then all of a sudden my allready rock hard cock started to throb as precum trailed down my shaft and pooled on my abdomen. She placed a blood pressure cuff on my left calf and pumped it up. She told me to flex and i did. Then she deflated it. She turned aroud and wrote something on my chart. She turned back around and in her hand she had a jar of vaseline. She dipped her middle finger in and came out with a good amount on her finger. She worked it into her hand and then much to my surprise she gently grabbed my cock and started stroking it ever so gently yet in a very professional manner. My breath deepened and my eyes rolled back in my head as she continued to stroke me. She told me to just relax and dont be afraid to let go if the feelings get to be too intense. Little did he know that i was very practiced at eging myself and had very good control over my body and its reaction to stimulus. She began stroking me faster and gripping my cock harder and working the head. I was panting like a dog by now and i looked her in the eyes and told her just how fuckin sexy i thought she was. I told her that i have always fantisized about her perfect legs and feet. She smiled again and did the scrunch of her nose bridge which totally drove me nuts. She stood between my legs facing me and she told me that w had to measure my percentsge of flex again. I looked at her confused but she just said try to relax your legs. She pumped up the blood pressure cuff on my calf again and she told me to flex my calves as hard as i could which was not a problem because i was flexing them all along until she made me stop. I was using the flexing as a means of coping with the pleasure i was encountering. She looked at me with a very cocky glance and said. Oh yeah its working. I looked down to see what she was talking about and noticed that since she started edging me that i had actually started to grow larger and more muscular. My calves were much more muscular than they were just 20 minutes before. She explained that she was using the blood pressure cuff to measure my growth. I was almost overcome with pleasure at this point and i could feel my face flushing a shade of red that is not natural. Just then i felt her sliding a lubed finger along my ass and then she gently and swiftly slid her middle finger in and quickly located my prostate. Immediately it felt like there were 1000 small fingers inside the head of my cock tickling it. I arched my back and grabbed the edges of the exam table as i yelled so loudly that i swore there is no way the people in the waiting room didnt hear me. "Oh fuck im gonna cum" i shot a huge load of cum that hit the wall behing the exam table. She wiped the vaseline and cum from her hands and once again pumped up the blood pressure cuff on my left calf. She made me flex it again and she then deflated it and removed it. She smiled and told me that it is working. She wrote something else on my chart and said. Ok good, the treatment is going to work.
from that day forward everytime i masturbated or had sex i would temporarily grow bigger and more muscular.