Wo Zai Yijie Kaobei Jue Shi Shen Gong

Reborn as the Demon Lord, but the only way for him to become the most powerful is is by copying the powers from girls? Wait, why is the process of copying so perverted? Mistress! Grand-Mistress! Great-Grand-Mistress! Please take it easy on your poor disciple! My body can't take it anymore! (Source: Tencent, translated)