Read Henjo - Hen na Joshi Kousei Amaguri Chiko Manga:
Amaguri Senko is a high school girl with a cool personality (as in, kuudere) and a big pervert. She openly reads porn and masturbates, and isnot perturbed in the slightest at the sight of penises and such. The story is about two adult men that come to live and work for her father, who runs a company that does various oddjobs, which she helps out with. And the various forms of s more.. exual harassment to which she subjects the one which she has taken a liking to.