In the dimly lit dungeon, a dominant master begins his submissive's anal training. The sub, eager to please, lies on his back, knees bent, exposing his tight hole. The master, armed with a massive dildo, lubes up and presses the head against the puckered entrance. The sub gasps as the toy begins to stretch him, inch by inch. The master's firm grip and steady thrusts ensure every millimeter is claimed, until the sub is moaning in pleasure-pain, his ass filled to the brim.