FURVERT!

animal_genitalia animal_penis ankle_cuffs anus ass_up backsack balls bdsm black_eyes black_nose bondage bondage_ring bone_gag bound brick brick_wall brown_body butt canid canine canine_genitalia canine_penis canis chain chained_to_floor collar cuff_(restraint)domestic_dog erection eyebrows feral gag gagged gaping gaping_anus genitals great_dane hanna-barbera hi_res inside internal_wall knot light_bulb looking_at_viewer male male_feral mammal mastiff mazedmarten molosser o-ring penis perineum presenting presenting_anus presenting_hindquarters quadruped raised_tail restraints scooby-doo scooby-doo_(series)signature solo submissive submissive_male tail tail_anus tied_to_pole vein veiny_penis wall_(structure)