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2013 abstract_background anthro anus ball_gag bdsm big_breasts big_butt biped black_body black_hair black_skin blush bondage bound breasts butt feet female flexible gag gagged genitals green_eyes hair hindpaw hippopotamid legs_behind_head legs_up mammal nipples nude overweight overweight_anthro overweight_female paws pygmy_hippopotamus restraints reva revadiehard rope short_hair simple_background slightly_chubby solo spread_legs spreading submissive submissive_female thick_thighs vulva wrists_to_ankles