Isekai Saikou no Kizoku, Harem wo Fuyasu Hodo Tsuyoku Naru (Novel)
Yuuto is suddenly reincarnated in the other world in a smartphone game and becomes the third son of a noble family. "Abilities" exist in this world, and Yuuto was reincarnated with "Noblesse oblige". When Yuuto, who has become an adult, makes love to a woman like a ceremony, "Noblesse oblige" is activated. This is a rare skill, the skill that allows him to copy the skills of the woman he makes love to! Yuuto makes love to women with abilities one after the other, becoming the strongest with the abilities he acquires and building a harem of women who fall in love with him. In addition, it has been discovered that "Noblesse oblige" can awaken skills and evolve abilities, and the cheats keep on coming! All the women and skills I want are mine! The strongest harem starts here!
