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2013 anthro anus backsack balls biceps big_muscles biped bodily_fluids butt fersir flaccid foreskin genital_fluids genitals grey_background hand_on_butt hi_res humanoid_genitalia humanoid_penis long_foreskin looking_at_viewer looking_back loose_foreskin male membrane_(anatomy)membranous_wings muscular muscular_anthro muscular_male nude penis precum prehistoric_species presenting presenting_hindquarters pteranodon pteranodontid pterosaur rear_view reptile scalie simple_background solo standing unretracted_foreskin winged_arms wings