ADN-660 Even Though I Don't Like Him Anymore, My Ex-Boyfriend Is Far Superior to My Current Boyfriend in Both Size and Sexual Prowess, So I Keep Sleeping with Him - Midorikawa Sui

The female protagonist already has a current boyfriend, but her ex-boyfriend far surpasses him in penis length and sexual kinks, leaving her unable to extricate herself. Despite no longer having feelings for her ex in her heart, she repeatedly sleeps with him, addicted to the irresistible pleasure. The story revolves around her inner turmoil and physical betrayal, revealing complex erotic entanglements.