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absurd_res anthro anus anus_focus asgore_dreemurr balls beard big_butt blonde_hair bodily_fluids body_writing boss_monster_(undertale)bovid bowser butt caprine duo facial_hair feet genitals goat hair heart_symbol hi_res horn koopa looking_at_another looking_back male mammal mario_bros mr.puerco musk musky_anus musky_butt nintendo nude overweight overweight_anthro overweight_male presenting presenting_anus presenting_hindquarters scalie solo_focus sweat sweaty_body tally_marks undertale_(series)western_tally_marks writing_on_butt