FURVERT!

animal_genitalia animal_penis anthro border_collie canid canine canine_genitalia canine_penis canis collie domestic_cat domestic_dog duo erection eyes_closed felid feline felis genitals herding_dog hi_res holding_another's_knot holding_another's_penis holding_knot holding_penis kaiberu kissing knot knot_grab male male/male mammal monochrome pastoral_dog penis penis_grab penis_tip romantic romantic_couple sheath sheepdog siamese_cat sitting sketch