FURVERT!

1:1 anthro balls big_penis biped bodily_fluids boxer_briefs boxers_(clothing)canid canine canis clothed clothing cum domestic_dog erection eyes_closed feet foreskin genital_fluids genitals grey_clothing grey_underwear hindpaw humanoid_feet humanoid_genitalia humanoid_penis k-9 lying male mammal masturbation on_back partially_retracted_foreskin paws penile penile_masturbation penis penis_poking_out plantigrade solo tail topless underwear