The Marquis Eldest Son's Lascivious Story

A Japanese salary man was reincarnated in a different world with swords and magic. He reincarnated into the family of a powerful noble. One day when he became twelve years old, he was suddenly summoned by his father. 「 I do not mind whether it is a woman in the town or a maid in our house, learn about women.」 Having gained the permission of his father, he uses his power as a noble to have his way with women.