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alpha_channel anthro balls belly blue_penis canid canine crotch_shot cyan_(cat)domestic_cat felid feline felis fluffy_balls genital_raphe genitals gradient_penis k0moya knot knotted_penis leg_markings male mammal markings penile_spines penis raphe_(anatomy)scrotal_raphe scrotum_flap siberian_cat solo tail thigh_markings thighs_together