Jinzou Ma○ko Hatsubai-chuu

The world is a place where artificial humans exist mainly for the purpose of sexual intercourse, which is not so different from that of human beings. The protagonist, who owns a high-class synthetic doll "Lady" left by his parents, is asked to practice sexual acts with her for an upcoming date. The protagonist enjoys a variety of play, from regular sex to anal sex!

(Source: Mujin Comics, translated)

Note: Published in Comic Mugen Tensei 2023-01, 05, 09, 2024-02 under the title My Fair Lady (マイ・フェア・レディ)