A highly detailed, cinematic 15-second anime-style video set inside a grand gothic church. Soft moonlight filters through large stained-glass windows. A beautiful horned woman with long dark hair and small curved horns straddles a man on the altar, riding him intensely. Her body moves with powerful, rhythmic thrusts, breasts bouncing, face flushed with pleasure. Around the 6–8 second mark she begins a radical demonic transformation while still riding him: her horns grow larger and sharper, skin darkens slightly, demonic markings spread across her body, and a dark aura of red and black energy erupts from her. Her eyes start glowing bright red. The stained-glass windows behind her rapidly shift to deep, glowing crimson red as energy radiates outward in pulsing waves. She continues riding harder, aura intensifying. At the 12–14 second climax the man cums deep inside her with visible throbbing, thick creampie overflowing as she throws her head back in ecstasy, fully transformed into a powerful demon girl with glowing red eyes, large horns, and radiating dark energy filling the church. Smooth fluid animation, dramatic lighting shifts from soft moonlight to intense red demonic glow, detailed physics on body and energy effects, high quality 4K anime rendering, dark and erotic atmosphere