かわいそうなキミがいちばんカワイイ-犬系執着男子ハルくんのしつけ交尾-

While exploring her masochism fetish by reading hardcore r18 manga, her neighbour Haru discovers her secret. “You've given me some wild fetishes, and now you're acting innocent. I can't tolerate that.” Her masochism drove him insane, and his obsessive love made her learn who he truly is. (Source: DLsite, translated)