The Fearless One (The Ones)

In a city where the law turns a blind eye, a man who can’t see becomes its deadliest enforcer.
Riven Vayne isn’t a hero. He avenges lives yes, but he does it by ripping people apart. Born from a violent experiment and raised in a system built to break him, Riven’s mission is simple; find the predators society protects and make them vanish.
But when a collision course with Quinn, a rope-bunny with a dark past and sharper tongue, forces him into the light, the lines between vigilante and victim start to blur. Together, they’ll uncover a web of corruption that stretches higher than either of them imagined.
Justice was never meant to be merciful.
Some tragedies are inevitable.

Tropes:
Instant love
Dark superhero romance
Vigilante serial killer
Heartbreakingly tragic
BDSM rope bunny FMC
Morally grey antihero MMC
Dark horror romance stand-alone
Enemies to lovers (but fast)
Obsessive MMC & FMC
Vision impaired (blind) representation (portrayed as a fictionalized super-mutation)
Revenge fantasy thriller
Shibari
Suspension
Breath play
Cold Branding
Extreme Gore