Rule 34 Dev - 2boys bar_censor blood body_horror bondrewd brain brain_fuck cum doshole erection experiment exposed_brain fully_clothed gay gore gueira guro helmet holding_penis immortality made_in_abyss male male_only mask masked masked_male penis penis_out pinned pinned_down questionable_consent scalpel sitting_on_person skull_fucking surgery tendrils yaoi|7039671680