Rule 34 Dev - 2016 2boys 4_toes akuro all_fours anal anal_sex anthro anus ass biceps box claws closed_eyes doggy_style dragon duo dutch_angle face_lick fasttrack37d from_behind_position gay grey_background greyscale hair hi_res horn humanoid_penis long_tail looking_back male male_only monochrome muscular muscular_male nude open_mouth partially_retracted_foreskin penetration penis perineum rear_view scalie sex simple_background stripes tail tail_tuft teeth testicles text tharis toe_claws toes tuft uncut veins veiny_penis watermark|2419164896