[delt]

I still remember getting pubic hair and lots of erections, some ending with spurts. I was proud of my new toy. My sister was 6 years older and had moved away to college.
We shared the upstairs bath with our grandmother.
I finished a bath and heard her arriving and yelling hello to grandma. I decided to let her see my new toy so I opened the bathroom door naked with a massive hard on, still drying off with a towel but making no effort to cover my nakedness. To my glee she stared at my cock. I was happy and with little action shot a load into the toilet.
The next morning I tried it again. She saw my hard cock and said “you have a nice penis for your age but I am your sister and don’t want to see it, especially with it erect. Go back into the toilet and do what you obviously need to do”. I did so.
After she left our Mom told me not to be naked with my sister. It makes girls nervous. Soon afterward she explained how sex worked.