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absurd_res anthro anus big_butt body_writing boss_monster_(undertale)bovid butt caprine female genitals greyscale hi_res looking_at_viewer mammal monochrome ppmp presenting presenting_anus presenting_vulva rear_view sketch solo tally_marks thick_thighs tic-tac-toe toriel undertale undertale_(series)vulva western_tally_marks writing_on_butt