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2d_animation 4:3 ambiguous_gender ambiguous_penetrated anal anal_penetration animated animated_gif anthro anus brown_body censored censored_anus censored_genitalia censored_penis duo fur genitals green_body green_fur grey_background lying male male/ambiguous male_penetrating male_penetrating_ambiguous manmosu_marimo on_back penetration penis sex short_playtime simple_background tail vein veiny_penis