The 6th volume of the popular Super-Sexual Boy series! When H-cup big sister Alice Amane is left at home alone with her good friend, she finds out that he's a boy with a super-sexual adult cock that's hard to believe he's younger than her! Even after ejaculating 16 times a day, his cock still has power! The frustrated big sister becomes addicted to creampie sex with the super-sexed Masao...