00 pm, at that time my family was sleeping in one bed room and closed the door so that Ac cooling will be appropriate. I opened the door and saw her i... black skin fit shirt and tights. She was looking dam hot and her cleavage is visible from the deep neck top which she wore. She gave me a sexy smile and asked that can I help her in her studies a little bit. I agreed instantly and took her in the drawing room. She said that she is studying Medical (male sexual organs) but as she never seen any. I think my mom enjoying teasing me she started wearing transparent kind of nighty during the day.One day I was watching an English movie with my mom which had a lot of nude scenes. I got a hard-on immediately. My mom was sitting beside me her boobs were touching my elbows. I started rubbing my hard-on through the shorts.My mom noticed “I think someone is playing with themselves ”“Yeah mom the movie is very interesting”I removed my cock outside and started masturbating. My mom was shocked she. The tight mini-dress showing her hourglass shape, the sheer black stockings her long slender legs, the 6 inch heels bringing out her pert little bottom, and the seemingly casual hair in a nonchalant bun, combined with subtle, yet seductive make up accentuated her fine sculpted face.She sensed that I really approved and admired her efforts and gradually she became a little less shy, standing like a newbie model in her very first photoshoot. It was incredibly cute to see how she tried to take on. This impression was enhanced by the fact that she was putting weight on both her legs. Subsequently, I noticed that her left knee was a bit stiff and that she was unable to bend it enough. She stopped abruptly, slipped her left foot out of her shoe and moved her delicate ankle around. Her rosy sole was visible through her stocking. After curling her toes a couple of times, she slipped her shoe back on and continued on her way. Gradually, her pace became slower and slower. At first, I thought.