The Marquis Eldest Son's Lascivious Story is a Manga/Manhwa/Manhua in (English/Raw) language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading The Marquis Eldest Son's Lascivious Story chapters on VipToon.Net, fastest updating comic site. The Summary is
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.