Bodies visibly bulk up on-panel, with arms, pecs, abs, and thighs swelling larger in a short span like a pumped-up transformation. The art usually leans hard into straining veins, torn clothes, and that smug power-trip vibe as the character gets stronger, heavier, and more physically imposing. It often shows up alongside sex as a domination kink, with the newly jacked body pinning someone down or fucking with brute force.