Kaikan Denryuu: Hitozuma Kairaku Jikken Hasebe Yuka-hen
In an apartment building in the afternoon, a young boy breaks into the room where a wife of a certain family is relaxing. Azuma, who makes full use of the "pleasure current" that sends a flood of pleasure through women with just a touch, continues to seduces the housewives living in the building with sexual pleasure. This is the beginning story of how he becomes the master of a concrete harem. Azuma was originally an introvert who was troubled by his unique constitution, but one day he hears the inner voice of a magician from another world, Rae, and realizes that he is the reincarnation of the magician. He follows the voice and learns the "pleasure current" and tests out his powers on the beautiful wife Yuka who lives next door...
(Source: Parabook, translated)