A Genius in the Family

My sister was always been the family genius since she was a child she has shown a fondness for science and technology. One day she said she wanted to show me her last invention so I followed her in the basement where I saw a strange machine. She made me sit and attached an electronic sensor on my head she did the same with her one and said me to relax. She turned on the machine and and after a second I found myself in her body. She said that we had to stay as each other for a while, like part of experiment.So the following days I went back to the high-school while she went to the college.After a few days she said that she found an investor for the swap machine I was happy for her and I wanted back in my body but there was  more; now in her new shape she was taken seriously and not like a kid with funny ideas so she wanted to remain in my body and developing new projects. I told to mom and dad what she did but they agreed with her, I suspect because they could earn some money with her projects and from their point of view they have always a son and a daughter in any case. So I started to accept my new role in the family, today mom want to go with me to buy me a dress for the upcoming prom.