by bigD_
Great start , now you need to have him measure her sizes and then they can”play” with each other seeing the parents are gone.
Very well written story that has subtle taboo exotic feel.
My 7.25" puts me in 99%. I feel sorry for teasing mom for so long.
Fun story. many sister like to see brother dick. Progresses to more sometime.
“I've never measured my dick.” said no adolescent boy ever! 😊 I knew by my second erection.
Hot story, wish it would continue. A comparison with the smaller guy, maybe.
I tried the calculation site: mine is at the bottom 0.5%