俺のタマノコシに乗ってくれ～従妹とメイドと後輩と先輩と先生と～

Kousuke is just an average student. But one day, he is kidnapped by some men on his way home and taken to a big house. The man in front of him says, "You, take over my position!" His a little bit erotic and slapstick life now starts....