Love, In Fire & Blood

Ben Solo is stalking Rey, a beautiful and much younger woman in one of his college classes. He's been under the impression that he's the 'bad' guy, until he finally breaks into her house and realizes his soulmate is beyond what he ever imagined. Follow two deeply disturbed people: one an obsessed, needy, and deranged stalker, and the other a cold, arrogant, and sadistic serial killer, as they begin to feed each other's unresolved psychological traumas and find their own unhealthy definition of balance.

Based upon the webtoon 'Killing Stalking,' which I HIGHLY recommend if you like this story. KS contains yaoi and this is obviously het, tho.