Rule 34 Dev - 1boy all_fours angrboda anthro ass backsack balls blush brown_body brown_fur brown_hair chemical clothed clothing erection fur genitals hair haplorhine human_to_anthro laboratory laboratory_equipment laboratory_glassware looking_back male male_focus male_only mammal monkey monkey_boy monkey_feet monkey_tail mostly_nude pants_down partially_clothed penis prehensile_feet primate scientific_instrument solo solo_focus species_transformation tail transformation vial|4497487336