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alfa_quinto_(artist)amur_carp anal anal_penetration anthro aquatic avian backsack balls big_butt bird body_swap butt carp colored_sketch cutaway cyprinid cypriniform duo fish from_behind_position genitals hi_res jericho_russo koi male male/male overweight overweight_anthro overweight_male owl penetration sex size_difference sketch slightly_chubby slightly_chubby_male typical_carp visible_self