2017 5_fingers all_fours anal anal_penetration anthro athletic balls beanie beige_penis blush bodi brown_fur brown_hair butt canine crossed_arms dog doggystyle erection fangs father father_and_son feet floppy_ears from_behind_position fur gloves_(marking) grey_nose hair hand_on_butt hat humanoid_feet humanoid_hands incest khampa koruro looking_at_viewer looking_back male male/male mammal markings multicolored_fur muscular nude one_eye_closed open_mouth parent pecs penetration penis plantigrade pubes rock_dog sex simple_background size_difference small_dom_big_sub son tan_balls tan_countershading tan_fur tibetan_mastiff two_tone_fur white_background wink