私のかわいい義理の妹はペニスが何であるかを知りたがっているので、私は彼女に彼女の人生で最高の解剖学のクラスを与えました。

My stepsister is very curious and shy and has never seen a penis in her life. She asks me to help her with a task she has, I explain it to her and she learns very well and as a reward I end up fucking her deliciously.