疎遠になっていた幼馴染（彼氏あり）の弱みを握ったのでセフレにしてみた

Embark on a provocative journey with Kasuga Makoto as he seizes the weakness of his estranged childhood friend Sakura Karen, who is in a relationship, to turn her into his secret lover. This Japanese web novel delves into themes of blackmail, betrayal, and forbidden desires, featuring a calm yet manipulative protagonist navigating through a world of harem, mature romance, and adult relationships. Experience the complexities of love, lust, and deceit in this captivating story.