SKMJ-698 "Want me to help you pull back the foreskin?" A voluptuous older sister pulls back her younger brother's foreskin and cleans him, helping him "grow up" (゜Д゜). The two sisters feel embarrassed in the mixed-gender bath, only to discover that the younger brother's foreskin is still intact, meaning he's still a virgin… The kind older sister uses soap to wash her brother's penis (laughs). When the younger brother's foreskin becomes as hard as a rock, and he ejaculates, the older sister says, "This is your first time…"