Darkness Hound. Unless you're referring to the chills one gets from being creeped out, in which case...none.
well notpia, shiiku gakari rika, the inheritance of aroma and nii-chan can creep u out(although i liked them)
I've read to much messed up shit for those to faze me in the slightest ╮(￣▽￣)╭
yeah i feel u...but i often try to empathize with the mc and when the mc is mentally ill things get weird .-.
A yaoi that gave you chills ?