しゃぶり姫 ～陰の章～

The story behind Shaburi is that you are a third class (the stinky one) magazine or news editor. You have been ordered by your boss to collect some news in some mountain. While at there, you got lost in the woods. By some luck, you are rescued and carefully nurtured by an owner of a big mansion in the mountain. After you gain your virility, the old man (who's the owner of the mansion) asked you to be his granddaughter's master and teach her. Since then, you will teach the owner's granddaughter everything about man.

[From animedensetsu]