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2017 2d_animation animated animated_gif anthro balls big_muscles canid canine canis erection frame_by_frame genitals humanoid_genitalia humanoid_penis knot male mammal masturbation muscular muscular_anthro muscular_male mythological_canine mythological_creature mythology penile penile_masturbation penis short_playtime simple_background solo werecanid werecanine werecreature werethrope werethrope_laporte werewolf wolf