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1:1 2023 adeer anatid anseriform anserine anthro arms_tied avian avian_feet bdsm biped bird bondage bound breasts digitigrade dildo dildo_kneeling dildo_sitting feet female genitals gimp_mask goose greyscale hands_behind_back hi_res kneeling mask monochrome nipples non-mammal_breasts non-mammal_nipples non-mammal_vulva penetration riding_dildo sensory_deprivation sex_toy simple_background solo spread_legs spreading vulva