Rule 34 Dev - 2018 all_fours ambiguous_gender ambiguous_penetration animated bat bat_wings betlv big_ears black_and_white digital_media_(artwork) doggy_style duo feral feral_on_feral from_behind_(disambiguation) from_behind_position line_art loop male male/ambiguous mammal membranous_wings monochrome nude penetration sex winged_arms wings|3146022584