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1:1 2012 abs animal_genitalia animal_penis anthro athletic balls biceps big_muscles big_penis biped bodily_fluids canid canine canine_genitalia canine_penis canis domestic_dog dwalker english_text erection flexing fur genital_fluids genitals grin hand_behind_head hi_res knot leaking looking_at_viewer male mammal muscular muscular_anthro muscular_male nipples nude pecs penis pose precum presenting sheath sitting sketch smile solo text v-cut