Scarlet Prostitute: Stabbing (1981) on Vidimovie
A gang boss orders the execution of a prostitute who witnessed a murder. When the boss' henchman discovers the prostitute is actually blind, he falls in love with her and protects her. The prostitute regains her sight just in time to see the death of her boyfriend. At his funeral, overcome with feelings of mixed joy and grief, she secretly masturbates.