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2013 abstract_background animal_genitalia anthro anus belly biped black_belly black_body black_scales bodily_fluids claws digital_media_(artwork)digitigrade dragon dreiker erection feet fingering fingering_own_slit fingering_self genital_fluids genital_slit genitals green_eyes half-closed_eyes horn knot knot_root legs_up looking_down lying male masturbation membrane_(anatomy)membranous_wings mythological_creature mythological_scalie mythology narrowed_eyes on_back open_mouth penetration penile penile_masturbation penis precum red_body red_scales scales scalie simple_background slit_fingering slit_masturbation slit_penetration slit_play solo spread_legs spreading tail tongue tongue_out wings yuri_(xdyuxd)