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abs anthro athletic athletic_female bed bodily_fluids canid canine chyme digestion digital_media_(artwork)duo esophageal_sphincter female flat_chested furniture guts hair human inside_stomach internal intestines iolite_(that_kei_guy)kei_(that_kei_guy)listening_to_belly male mammal medical_instrument midriff monochrome navel not_furry_focus on_bed organs scientific_instrument short_hair stethoscope stomach stomach_acid that_kei_guy