HUNTA-892 "Big brother, let me wash your back!" This slightly precocious and innocent younger sister wants to take a bath with me despite her chest starting to develop. What is my little sister's true intention...?

My little sister is way too cute. When we were alone in the narrow bathtub and she was washing my back, her slightly swollen small breasts kept touching me, making me fully erect! My sister actually had a purpose for wanting to take a bath together! That somewhat precocious sister actually wanted to see my dick! And because of this situation, my lower half was unknowingly fully erect! Seeing my erection, my sister got excited and reached out to my dick, saying, 'I wanted to see it in the light!'