Rule 34 Dev - anthro backsack backwards_penis balls big_balls big_penis bottomwear bottomwear_aside bulge canid canine canis castbound clothed clothing clothing_aside domestic_dog erection flexible foreskin genitals hi_res humanoid_genitalia humanoid_penis looking_at_viewer lying male mammal muscular on_front penis red_eyes retracted_foreskin russell_(castbound) short_stack short_tail shorts shorts_aside shorts_only solo splits spread_legs spreading tail tongue tongue_out topless vein veiny_penis|9576135896