Amagami no Shitsuke Kata: Hanten

Don't get me wrong, "dog". Wakamatsu, a popular young trainer at a members-only BDSM club, has his secret discovered by Sakuraba, a member of the same club. Sakuraba, who has been secretly wanting to have Wakamatsu, proposes a deal to him: "I wanna whip you"...!? This is the story of Wakamatsu switching from being a sadist to being a masochist.