This is like 50 shades in manga form but at least in 50shades there's consent. I think in wanting to find a submissive partner, don't you think he could at least told her from the start that he's a sadist? The story's your typical shoujo story but with sex.
Omae no Kuchi wo Husaganaitona? -Kare ni Osowaru M no Hinkaku-