 If you liked
Ibitsu
|
 ...then you might like
Tsumi to Kai
|
In both Mangas, the Male Lead did something bad to the Female Lead (upskirt photo in Tsumi and train groping in Ibitsu) then they are blackmailed by the FL to continue their relationship.
There are multiple people that try to break apart the main couple by blackmailing them with photos or videos of the femdom done in public.
Ibitsu is much darker and depraved than Tsumi to Kai