FURVERT!

animal_genitalia animal_penis anthro belly bodily_fluids canid canine canine_genitalia canine_penis canis detailed_internal erection genitals inside_stomach internal knot male mammal masturbating_prey masturbation masturbation_inside_body masturbation_inside_stomach navel nude organs penile penile_masturbation penis sillyme soft_vore solo stomach stomach_acid unseen_pred vore wolf