Recently I went to my usual six month dental exam. I actually purposely dressed a bit more feminine for this exam. Had silky lace pink panties on - a aqua cap sleeve juniors shirt unisex shorts and sandles. My hair was as long as I have worn it - shoulder length. While I was sitting there my hygienist and I started talking about nutrition. She started telling me about muscle building foods and some hormone enhancing foods she had learned about and was taking. While we were talking I could not help but notice that she appeared to have gained weight from when I had seen her six months prior. Her hair was now actually cut short; much shorter than mine. She actually looked like she was close to my size, which was quite a change, from her 100+ pound body that I had recalled. I also now noticed she was larger up top and wearing a very large dentist scrub. She told me she had just started to body build when I saw her for my last exam. She said she had started to lift weights three hours daily and said she was getting ready for a competition. I saw a picture of her and her bicepts were now hudge. It looked like she had gained up to 30 pounds of muscle. She said she was around 130 to 135 pounds and 8% body fat. Then I told her I was between 18 to 22% BF. It was at that point I started to wonder what she was thinking as she looked at my skinny scrawny feminine looking body on the chair. She then asked me what I weighted and when I told her, between 138 to 140, she jokingly said "I bet I can whip your ass." I responded "you are likely right", sensing she now had bigger and harder muscles than mine. I then said how can we do this? Arm wrestle? I actually was getting a bit embarrassed at this time knowing that my arms actually looked like girls arms. I then told her I hoped she did well in her competition. We hugged as I left and then I really felt her harder arm and chest muscles against my soft body. Though she did not mix me up thinking I was a girl - I still had the same feelings - suddenly next to her I felt feminine - A real gender bender.