Isekai Saikou no Kizoku, Harem wo Fuyasu Hodo Tsuyoku Naru

The third son of a noble family, Yuuto, finds himself reborn in a parallel universe that mirrors a smartphone game. This alternate world possesses a vast array of "Skills," which Yuuto has the rare ability of "Noblesse oblige." When he reaches maturity, he activates this unique power by embracing a woman in a ceremonial rite. With "Noblesse oblige," he gains the skills of the woman he embraces. Yuuto embarks on a quest to build a harem of talented women, who will undoubtedly succumb to his charm. He discovers that his powers can enhance and improve existing skills, elevating his cheating abilities. As a result, he establishes the most powerful harem ever known. Every woman and their abilities belong to him. Thus begins the extraordinary journey of the ultimate cheating harem.