Bodies visibly change mid-scene, like a girl sprouting horns and a tail, turning into a monster, aging up, or even swapping sex while the panels linger on the new tits, hips, or cock. The art usually sells it with step-by-step closeups of stretching skin and sudden growth, then immediately pivots into fucking that matches the new anatomy, complete with messy fluids and typical mosaic censorship on genitals. Sometimes the change is the kink itself, with the victim getting overwhelmed as their body rewires into something built to take dick.